thyrosphere

Etymology tree
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
Ancient Greek -ο- (-o-)der.
Latin -o-bor.
English -o-
English thyro-
Ancient Greek σφαῖρᾰ (sphaîră)bor.
Latin sphaera
Late Latin sphērader.
Old French spherebor.
Middle English spere
English sphere
English -sphere
English thyrosphere
From thyro- + -sphere.