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levothyroxine

US/ˌli.voʊ.θaɪˈɹɑkˌsin/US/ˌli.voʊ.θaɪˈɹɑk.sɪn/

noun

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.

OriginEnglish thyroxine ← New Latin thyreoīdēs ← Ancient Greek θῠρεοειδής (thŭreoeidḗs) →

UncommonScrabble 29

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Meanings

nounlevothyroxine (uncountable)

alternative UK laevothyroxine

uncountablemedicineThe levorotatory isomer of thyroxine (trademark Levothyroid, Levoxyl, Synthroid) that is administered in the form of its sodium salt C₁₅H₁₀I₄NNaO₄ in the treatment of hypothyroidism.

Origin

Proto-Indo-European*leh₂iwos
Latinlaevus
Englishlevo-
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)
New Latinthyreoīdēs
Englishthyroid
Englishthyr-
Englishox-
Englishthyroxine
Englishlevothyroxine

From levo- + thyroxine.

Full word history & related roots →

Translations

French lévothyroxine

lévothyroxineTranslations

Italian levotiroxina

levotiroxinaTranslations

Spanish levotiroxina

levotiroxinaTranslations

Rhymes & wordplay

Rhymes with levothyroxine

toxin dioxin digoxin thyroxine tocsin amatoxin antiantitoxin difenoxin gastrotoxin kurtoxin lycotoxin mitotoxin ophiotoxin vomitoxin

Cite this entry

APA

levothyroxine. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/levothyroxine

MLA

“levothyroxine.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/levothyroxine. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “levothyroxine,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/levothyroxine.

Source: levothyroxine on Wiktionary, CC BY-SA 4.0.