triiodothyronine

tri·io·do·thy·ro·nine

noun \ˌtrī-ˌī-əd-ō-ˈthī-rə-ˌnēn\

Definition of TRIIODOTHYRONINE

: a crystalline iodine-containing hormone C₁₅H₁₂I₃NO₄ that is an amino acid derived from thyroxine and is used especially in the form of its soluble sodium salt C₁₅H₁₁I₃NNaO₄ in the treatment of hypothyroidism and metabolic insufficiency—called also liothyronine, T3