English

gnathotheca

From gnatho- + theca.

Ancient Greek γνάθος ‘jaw’

Proto-Indo-European *dʰeh₁- ‘to put, place’

Proto-Indo-European *dʰédʰeh₁ti ‘to be putting, placing’

Ancient Greek τίθημι ‘put, set, place’

Ancient Greek θήκη ‘a case, box, receptacle’

Latin thēca ‘a case, envelope, sheath’

English theca

Today it means

noun The horny covering of the lower part of a bird's beak.

Language periods are conventional ranges, not dates for this word.

Etymograph / gnathotheca