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Definition
 
enEnglish
Choanal Atresia definition: A congenital abnormality that is characterized by a blocked CHOANAE, the opening between the nose and the NASOPHARYNX. Blockage can be unilateral or bilateral; bony or membranous.
NOSTRIL definition: One of the two channels of the nose, from the point where they divide to the external opening. (NCI)
Nostril definition: One of the two channels of the nose, from the point where they divide to the external opening.