Also found in: Thesaurus, Medical, Encyclopedia.
An animal having a specified kind of body temperature: poikilotherm.
any of several units of heat, as one equivalent to 1000 large calories or 100,000 British thermal units.
[1885–90; < Greek thérmē heat]
var. of thermo- before a vowel: thermion.
var. of thermo- as a final element: ectotherm.