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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tetraiodothyronine is a noun meaning "hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells". It carries one recorded sense.
hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells
“thyroxine is 65% iodine”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for tetraiodothyronine come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.