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Medical Definition of Secondary choana
1. The definitive choana opening into the nasopharynx, after the nasal chambers have been lengthened by the formation of the secondary palate. Synonym: internal nostril. (05 Mar 2000)
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1. The definitive choana opening into the nasopharynx, after the nasal chambers have been lengthened by the formation of the secondary palate. Synonym: internal nostril. (05 Mar 2000)