exotherm exothecium • exothermal · · · Info · Definitions · Characters · · exotherm · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) a compound that gives off heat during its formation and absorbs heat during its decomposition. · · Noun Definition 1 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 x latin small letter x U+0078