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Definition of Choana

Choana: An opening at the back of the nasal passage (there is a left and a right side) that empties into the space behind the nose called the nasopharynx, where the adenoids and eustachian tube are. The passage way continues down into the back of the mouth and into the throat.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=39034
Last Editorial Review: 9/20/2012

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