Entry 1 sense Webster, 1913 Thermic · Ther·mic · IPA /ˈθɜː(ɹ)mɪk/ 01 a. Of or pertaining to heat; due to heat; thermal; as, thermic lines. 1. Of or pertaining to heat; due to heat; thermal; as, thermic lines. Phrases & compounds Thermic balance — See Bolometer. Thermic fever — the condition of fever produced by sunstroke. See Sunstroke. Thermic weight — Same as Heat weight, under Heat.