hypothyroidy

Etymology tree
Proto-Indo-European *upó
Ancient Greek ῠ̔πό (hŭpó)
Ancient Greek ὑπο- (hupo-)der.
English hypo-
Proto-Indo-European *dʰwer-der.
Proto-Hellenic *tʰurā
Ancient Greek θῠ́ρᾱ (thŭ́rā)
Ancient Greek -εος (-eos)
Ancient Greek θῠρεός (thŭreós)
Proto-Indo-European *weyd-
Proto-Indo-European *-os
Proto-Indo-European *wéydos
Proto-Hellenic *wéidos
Ancient Greek εἶδος (eîdos)
Proto-Indo-European *-os
Proto-Indo-European *-ēs
Ancient Greek -ης (-ēs)
Ancient Greek -ειδής (-eidḗs)
Ancient Greek θῠρεοειδής (thŭreoeidḗs)bor.
New Latin thyreoīdēsbor.
English thyroid
English hypothyroid
Proto-Indo-European *-yós
Proto-Italic *-ios
Old Latin -ios
Latin -ius
Latin -ia
Old French -ieder.
Middle English -ie
Middle English -y
English -y
English hypothyroidy
From hypothyroid + -y.