-TROPIC Meaning of -TROPIC in English ■ combining form1》 turning towards: heliotropic.2》 affecting: psychotropic.3》 (especially in names of hormones) equivalent to -trophic .Originfrom Gk tropē 'turn, turning'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004