Etymology

levothyroxine

L1E1V4O1T1H4Y4R1O1X8I1N1E1

Today it means: The levorotatory isomer of thyroxine (trademark Levothyroid, Levoxyl, Synthroid) that is administered in the form of its sodium salt C₁₅H₁₀I₄NNaO₄ in the treatment of hypothyroidism. Full definition →

English thyroxine ← New Latin thyreoīdēs ← Ancient Greek θῠρεοειδής (thŭreoeidḗs)
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The story

  1. Proto-Indo-European*leh₂iwos
  2. Latinlaevus
  3. Englishlevo-
  4. Proto-Indo-European*dʰwer-
  5. Proto-Hellenic*tʰurā
  6. Ancient Greekθῠ́ρᾱ (thŭ́rā)
  7. Ancient Greekθῠρεός (thŭreós)
  8. Proto-Indo-European*weyd-
  9. Proto-Indo-European*wéydos
  10. Proto-Hellenic*wéidos
  11. Ancient Greekεἶδος (eîdos)
  12. Ancient Greekθῠρεοειδής (thŭreoeidḗs)
  13. New Latinthyreoīdēs
  14. Englishthyroid
  15. Englishthyr-
  16. Englishox-
  17. Englishthyroxine
  18. English todaylevothyroxine

From levo- + thyroxine.

Etymology from Wiktionary, CC BY-SA 4.0.