SYN: naris.
- internal n. SYN: secondary choana.
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nos·tril 'näs-trəl n
1) either of the external nares broadly either of the nares with the adjoining passage on the same side of the nasal septum
2) either fleshy lateral wall of the nose
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nos·tril (nosґtril) naris; see nares.Medical dictionary. 2011.