tropismecommon nounEtymologyexpandfrom Greek τρόπος, trópos, trepein, "turn, turn, direction, have an affinity for".Definitions1. A reaction of positioning caused by physicochemical agents and observed in some plants (orientation) and insects (locomotion).biologieexpand2. An irresistible inclination that forces an individual to react in a determined manner.figurativeexpand3. A basic inexplicable psychological reaction.figurativeexpandPluraltropismes