thermo-

1. a combining form meaning “heat,” “hot,” used in the formation of compound words: thermoplastic.

combining form

1. related to, caused by, or measuring heatthermodynamics; thermophile

word-forming element meaning “hot, heat,” used in scientific and technical words, from comb. form of Greek thermos “hot,” therme “heat” (see thermal). pref.

1. Heat:thermogenesis.

1. A prefix that means “heat,” as in thermometer.