dict.md logo
Choose languages of interest
Add further languages:
Add all languages
Agglutination Tests definition: Tests that are dependent on the clumping of cells, microorganisms, or particles when mixed with specific antiserum. (From Stedman, 26th ed)
agglutination reaction definition: mixing of antibodies with their corresponding antigens on the surface of large, easily sedimented particles such as animal cells, erythrocytes, or bacteria; the antibodies cross-link the particles, forming visible clumps.
Anaphylaxis definition: An acute hypersensitivity reaction due to exposure to a previously encountered ANTIGEN. The reaction may include rapidly progressing URTICARIA, respiratory distress, vascular collapse, systemic SHOCK, and death.
anaphylaxis definition: a manifestation of immediate hypersensitivity in which exposure of a sensitized individual to a specific antigen or hapten results in urticaria, pruritis and angioedema, followed by vascular collapse and shock often accompanied by life threatening respiratory distress.
Shock, Anaphylactic definition: Systemic anaphylaxis is the most dramatic example of an immediate hypersensitivity reaction; is uncommon and unexpected in nature and occasionally results in a fatal outcome.
Shock, Anaphylactic definition: Pertaining to anaphylaxis.
Anaphylactic Shock definition: An acute inflammatory reaction resulting from the release of histamine and histamine-like substances from mast cells, causing a hypersensitivity immune response. Clinically, it presents with breathing difficulty, dizziness, hypotension, cyanosis and loss of consciousness, and may lead to death.
anaphylaxis definition: OBSOLETE. Extreme immunological sensitivity of the body or tissues to the reintroduction of an antigen. It is a form of anamnestic reaction and is accompanied by pathological changes in tissues or organs due to the release of pharmacologically active substances. [ISBN:0198506732 "Oxford Dictionary of Biochemistry and Molecular Biology"]
Anxiety definition: Feeling of distress or apprehension whose source is unknown.
Anxiety definition: Feeling or emotion of dread, apprehension, and impending disaster but not disabling as with ANXIETY DISORDERS.
anxiety definition: unpleasant, but not necessarily pathological, emotional state resulting from an unfounded or irrational perception of danger; compare with FEAR and CLINICAL ANXIETY.
Anxiety definition: Apprehension of danger and dread accompanied by restlessness, tension, tachycardia, and dyspnea unattached to a clearly identifiable stimulus.
Arthus Reaction definition: A dermal inflammatory reaction produced under conditions of antibody excess, when a second injection of antigen produces intravascular antigen-antibody complexes which bind complement, causing cell clumping, endothelial damage, and vascular necrosis.
Arthus phenomenon definition: development of an inflammatory lesion a few hours after intradermal injection of antigen into a sensitized animal; the lesion results from precipitation of immune complex, which causes complement activation and tissue destruction.
Biuret Reaction definition: A reaction characterized by a violet color upon the addition of copper sulfate to all compounds with two amide or peptide bonds linked directly or through an intermediate carbon atom. Used in the detection and estimation of proteins and peptides having more than two amino acids.
Catatonia definition: A neuropsychiatric disorder characterized by one or more of the following essential features: immobility, mutism, negativism (active or passive refusal to follow commands), mannerisms, stereotypies, posturing, grimacing, excitement, echolalia, echopraxia, muscular rigidity, and stupor; sometimes punctuated by sudden violent outbursts, panic, or hallucinations. This condition may be associated with psychiatric illnesses (e.g., SCHIZOPHRENIA; MOOD DISORDERS) or organic disorders (NEUROLEPTIC MALIGNANT SYNDROME; ENCEPHALITIS, etc.). (From DSM-IV, 4th ed, 1994; APA, Thesaurus of Psychological Index Terms, 1994)
Conversion Disorder definition: A disorder whose predominant feature is a loss or alteration in physical functioning that suggests a physical disorder but that is actually a direct expression of a psychological conflict or need.
Cross Reactions definition: Serological reactions in which an antiserum against one antigen reacts with a non-identical but closely related antigen.
Reactive Depression definition: Depression precipitated by events in a person's life.
Dissociative Disorders definition: Sudden temporary alterations in the normally integrative functions of consciousness.
Echolalia definition: Involuntary ("parrot-like"), meaningless repetition of a recently heard word, phrase, or song. This condition may be associated with transcortical APHASIA; SCHIZOPHRENIA; or other disorders. (From Adams et al., Principles of Neurology, 6th ed, p485)
Escape Reaction definition: Innate response elicited by sensory stimuli associated with a threatening situation, or actual confrontation with an enemy.
escape reaction definition: innate response elicited by sensory stimuli associated with a threatening situation, or actual confrontation with an enemy.
Flushing definition: A transient reddening of the face that may be due to fever, certain drugs, exertion, stress, or a disease process.
Flushing definition: A sudden reddening of the face.
Grief definition: Normal, appropriate sorrowful response to an immediate cause. It is self-limiting and gradually subsides within a reasonable time.
Grieving definition: Feeling of great sorrow.
grief definition: sorrowful response to an immediate cause; self-limiting and gradually subsides within a reasonable time.
Grief definition: Suffering and distress associated with loss.
Hypersensitivity definition: Altered reactivity to an antigen, which can result in pathologic reactions upon subsequent exposure to that particular antigen.
hypersensitivity definition: state of previously immunized body in which tissue damage results from the immune response to a further dose of antigen.
Allergy definition:

Hypersensitivity to an agent caused by an immunologic response to an initial exposure

Hypersensitivity definition: Hypersensitivity; a local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and to which it has become sensitized.
hypersensitivity definition: An exaggerated response by the immune system to a drug or other substance.
hypersensitivity definition: An inflammatory response to an exogenous environmental antigen or an endogenous antigen initiated by the adaptive immune system. [GOC:jal, ISBN:0781735149 "Fundamental Immunology"]
Hypersensitivity definition: A local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and to which it has become sensitized.
Immunologic Memory definition: The altered state of immunologic responsiveness resulting from initial contact with antigen, which enables the individual to produce antibodies more rapidly and in greater quantity in response to secondary antigenic stimulus.
immunologic memory definition: altered state of immunologic responsiveness resulting from initial contact with antigen, which enables the individual to produce antibodies more rapidly and in greater quantity in response to secondary antigenic stimulus.
anamnestic reaction definition: renewed rapid production of an antibody on the second (or subsequent) encounter with the same antigen.
Leukemoid Reaction definition: A peripheral blood picture resembling that of leukemia or indistinguishable from it on the basis of morphologic appearance alone. (Dorland, 27th ed)
Maillard Reaction definition: One of a group of nonenzymatic reactions in which aldehydes, ketones, or reducing sugars react with amino acids, peptides, or proteins. Food browning reactions, such as those that occur with cooking of meats, and also food deterioration reactions, resulting in decreased nutritional value and color changes, are attributed to this reaction type. The Maillard reaction is studied by scientists in the agriculture, food, nutrition, and carbohydrate chemistry fields.
Panic definition: A state of extreme acute, intense anxiety and unreasoning fear accompanied by disorganization of personality function.
Prussian Blue Reaction definition: The reaction of potassium ferrocyanide with ferric iron to yield a dark blue precipitate at the sites of the ferric iron. Used to determine ferric iron in tissues, particularly in the diagnosis of disorders of iron metabolism.
Retrograde Degeneration definition: Pathologic changes that occur in the axon and cell body of a neuron proximal to an axonal lesion. The process is characterized by central chromatolysis which features flattening and displacement of the nucleus, loss of Nissl bodies, and cellular edema. Central chromatolysis primarily occurs in lower motor neurons.
axon reaction definition: series of changes in the ganglion cell following the severing of its axon.
drug adverse effect definition: unintended, deleterious effects of otherwise licit, therapeutic, properly administered drugs; for effects of illicit and abused drugs, or of environmental chemicals, see TOXICOLOGY or POISONING.
Postprandial Hypoglycemia definition: HYPOGLYCEMIA expressed after a meal or FOOD INTAKE. It is also called reactive or stimulative hypoglycemia.
Autoimmune definition: Pertaining to autoimmunity.
Autoimmune Process definition: Developmentally complex, not necessarily pathological, and possibly pervasive, an Autoimmune Process is a specific humoral or cell-mediated immune response against autologous (self) antigens. An autoimmune process may produce or be caused by autoimmune disease.
Reaction definition: A response generated by a stimulus.
iodination definition: incorporation or addition of iodide in a compound.
Adverse Reaction definition:

Indicates that the observation is of an unexpected negative occurrence in the subject suspected to result from the subject's exposure to one or more agents. Observation values would be the symptom resulting from the reaction.

Adverse Reaction definition: Any noxious and unintended response(s) to a medical product or procedure, for which a causal relationship with this product or procedure is at least a reasonable possibility i.e., the relationship cannot be ruled out.
chemical reaction definition: chemical change in which the atoms or molecules of two or more substances are rearranged to form one or more additional substances, often having different properties.
acrosome reaction definition: The discharge, by sperm, of a single, anterior secretory granule following their attachment to the zona pellucida surrounding the oocyte. The process begins with the fusion of the outer acrosomal membrane with the sperm plasma membrane and ends with the disperasl of the acrosomal contents into the egg. [GOC:dph, PMID:3886029]
Acrosome Reaction definition: Changes that occur to liberate the enzymes of the ACROSOME of a sperm (SPERMATOZOA). Acrosome reaction allows the sperm to penetrate the ZONA PELLUCIDA and enter the OVUM during FERTILIZATION.
fluoridation definition: incorporation or addition of fluoride in a compound.
catalase activity definition: Catalysis of the reaction: 2 H2O2 = O2 + 2 H2O. [EC:]
hydroperoxidase reaction definition: OBSOLETE. The processes involved in the induction or activation of catalase, an enzyme that catalyzes the conversion of H2O2 into H2O. [GOC:jl, PMID:11245904]
Decidual Reaction definition: The cellular and vascular changes occurring in the endometrium at the time of implantation.
biochemical reactions definition: In living cells, chemical reactions that help sustain life and allow cells to grow.
Biochemical Reaction definition: A chemical process, typically mediated by an enzyme, in which one or more substances (a substrate) are transformed by covalent modification into another substance(s) (a product) or in which the state of a substance is transformed.
Desmoplastic definition: This term refers to the growth of fibrous or connective tissue. Some tumors elicit a desmoplastic reaction, the pervasive growth of dense fibrous tissue around the tumor. Scar tissue (adhesion) within the abdomen after abdominal surgery is another type of desmoplastic reaction. (MedicineNet.com)
Insulin Shock definition: A hypoglycemic reaction to overdosage of insulin, a skipped meal, or strenuous exercise in an insulin-dependent diabetic.
Shock, Insulin definition: A hypoglycemic reaction to overdosage of insulin, a skipped meal, or strenuous exercise in an insulin-dependent diabetic.
Insulin Shock definition: Sudden significant drop in BLOOD GLUCOSE or hypoglycemic shock which affects the hemodynamic equilibrium of all vital organs.
reaction definition: [1] Reaktion, Resonanz, Rückwirkung [2] (Mechanik) Auflagekraft [3] Stellungnahme
reaction definition: Conséquence, répercussion, réponse, réaction.
reaction definition: Réaction.
Reaktion definition: [1] Handlung, die aus einer vorhergehenden Handlung oder einem Reiz kausal folgt [2] wissenschaftlich: Verhalten eines Objekts auf einen Stimulus (Stoff, Energie etc.)
Addition definition: [1] Mathematik: Zusammenzählung zweier Zahlen [2] Chemie: Reaktion, bei der zwei Moleküle verbunden werden, ohne dass ein weiteres Reaktionsprodukt entsteht
Kettenreaktion definition: [1] Chemie, Physik: Reaktion, bei der nach einer Startreaktion mehrere Reaktionen hintereinander ablaufen
réaction definition: [1] Reaktion, Rückwirkung, Gegenwirkung, Reaktion
conséquence definition: Suite qu’une action ou un événement peut avoir.
conséquence definition: Importance.
conséquence definition: Conclusion tirée d’une ou plusieurs propositions et, en général, ce qui dérive, ce que l’on déduit d’un principe, d’un fait, etc.
réaction definition: Action d’un corps sur un autre qui agit ou vient d’agir sur lui.
réaction definition: Modifications d’ordre chimique résultant de l’action d’un corps sur un autre.
réaction definition: Action de l’organisme en réponse à une excitation quelconque.
réaction definition: Émotion que provoque un reproche, une menace, une nouvelle heureuse ou fâcheuse, etc.
réaction definition: Mouvement d’opinion qui agit dans un sens contraire au mouvement qui a précédé.
réaction definition: Action d’un parti politique qui s’efforce de rétablir l’état de choses antérieur.
réaction definition: Ce parti lui-même.
réaction definition: Chacun des mouvements plus ou moins vifs et brutaux d’un cheval, et chacune des secousses que ces mouvements font éprouver au cavalier.
réponse definition: Parole dite à celui qui fait une demande, une question.
réponse definition: Écrit, d’une lettre répondant à un autre écrit.
réponse definition: #* '''''Réponse''' payée,'' Télégramme dont la taxe est acquittée d’avance par celui qui demande une '''réponse''' à son propre télégramme.
réponse definition: Réfutation.
réponse definition: Il se dit particulièrement, en termes de procédures des écritures qu’une partie fait signifier pour répondre aux moyens que l’autre a présentés.
réponse definition: Motif d’une fugue qui répond, qui correspond au sujet.
répercussion definition: Renvoi, réflexion (en parlant des sons, de la lumière, de la chaleur).
répercussion definition: Dans le langage général, il signifie Conséquence, choc en retour.