| choana | The opening into the nasopharynx of the nasal cavity on either side. Synonym: isthmus pharyngonasalis, posterior naris, postnaris. Origin: Mod. L. Fr. G. Choane, a funnel (05 Mar 2000) |
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| choanal | Pertaining to a choana. (05 Mar 2000) |
| choanal atresia | Congenital bony or membranous occlusion of one or both choanae, due to failure of the embryonic bucconasal membrane to rupture. (12 Dec 1998) |
| choanal polyp | An antral-choanal polyp that extends into the nasopharynx; generally originates in the antrum. (05 Mar 2000) |
| choanate | Having a funnel, i.e., with a ring or collar. (05 Mar 2000) |
| choanoflagellate | A term, in the series used to describe developmental stages of the parasitic flagellates, denoting the "barleycorn" form of the flagellate in the genus Crithidia characterised by a collarlike extension surrounding the anterior and through which the single flagellum emerges. See: amastigote, epimastigote, promastigote, trypomastigote. Synonym: choanoflagellate, collared flagellate. Origin: G. Choane, a funnel, + mastix, whip (05 Mar 2000) |
| choanoid | Funnel-shaped. Synonym: infundibuliform. Origin: G. Choane, funnel, + eidos, resemblance (05 Mar 2000) |
| choanomastigote | A term, in the series used to describe developmental stages of the parasitic flagellates, denoting the "barleycorn" form of the flagellate in the genus Crithidia characterised by a collarlike extension surrounding the anterior and through which the single flagellum emerges. See: amastigote, epimastigote, promastigote, trypomastigote. Synonym: choanoflagellate, collared flagellate. Origin: G. Choane, a funnel, + mastix, whip (05 Mar 2000) |
| Choanotaenia infundibulum | An important species of cosmopolitan tapeworm of fowls, occurring in the small intestine and transmitted by houseflies and stableflies; related to Dipylidium, the double-pored dog tapeworm. Origin: G. Choane, a funnel, + L., fr. G. Tainia, tapeworm (05 Mar 2000) |