-tropicPronunciation: /ˈtrəʊpɪk, ˈtrɒpɪk/Definition of -tropic combining form 1turning towards:heliotropic 2affecting:psychotropic 3(especially in names of hormones) equivalent to -trophic. Origin:from Greek tropē 'turn, turning'-tropic in other Oxford dictionaries Definition of -tropic in the US English dictionary