tropism tropine • tropismatic · · · Info · Definitions · Characters · · tropism · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) an involuntary orienting response; positive or negative reaction to a stimulus source. · · Noun Definition 1 Characters · · i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074