The story
- Proto-Indo-European*ster-
- Proto-Indo-European*sterh₃-
- Proto-Indo-European*stér(h₃)-no-m
- Ancient Greekστέρνον (stérnon)
- Latinsternum
- Proto-Indo-European*dʰwer-
- Proto-Hellenic*tʰurā
- Ancient Greekθῠ́ρᾱ (thŭ́rā)
- Ancient Greekθῠρεός (thŭreós)
- Proto-Indo-European*weyd-
- Proto-Indo-European*wéydos
- Proto-Hellenic*wéidos
- Ancient Greekεἶδος (eîdos)
- Ancient Greekθῠρεοειδής (thŭreoeidḗs)
- Latinthyreoīdēs
- New Latinsternothyreoīdēs
- English todaysternothyroid
Borrowed from New Latin sternothyreoīdēs, from sternum (“the breastbone”) + -o- + thyreoīdēs (“shield-shaped”); equivalent to sterno- + thyroid. Doublet of sternothyroideus.
Etymology from Wiktionary, CC BY-SA 4.0.