hypothyroidism hypothyroid • hypotonia · · · Info · Definitions · Antonyms · Characters · · hypothyroidism · · Text Latin · · Script 14 · · Length 6 · · Syllables Definitions · · · (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones. · · Noun Definition 1 Antonyms · · · hyperthyroidism · · Antonym 0 thyrotoxicosis · · Antonym 1 Characters · · d latin small letter d U+0064 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079