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levothyroxine.

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.

13 characters5 syllables approx.English language

Meaning & usage

noun/ˌli.voʊ.θaɪˈɹɑkˌsin/General-American/ˌli.voʊ.θaɪˈɹɑk.sɪn/General-American
  1. 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.

    uncountable
Where this word comes from

Etymology tree Proto-Indo-European *leh₂iwosder. Latin laevus English levo- 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 Proto-Hellenic *-ēs Ancient Greek -ης (-ēs) Ancient Greek -ειδής (-eidḗs) Ancient Greek θῠρεοειδής (thŭreoeidḗs)bor. New Latin thyreoīdēsbor. English thyroid English thyr- English ox- English -ine English thyroxine English levothyroxine From levo- + thyroxine.

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Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.