postnasal
/ˌpəʊs(t)ˈneɪzl/noun
1Chiefly Palaeontology. In a fish: a bone or bony plate located posterior to the nasal bone in the snout. rare.
2 Zoology. In a reptile: a scale on the side of the head, situated either immediately behind the nostril, or posterior to the nasal scale.
adjective
Situated or occurring behind or posterior to the nasal aperture or the nasal cavity.
Origin
Mid 19th century; earliest use found in Spencer Baird (1823–1887), zoologist and scientific administrator. From post- + nasal. With use as adjective compare prenasal.