-tropism

From Latin tropus (English trope) +‎ -ism, from Ancient Greek τρόπος (trópos, “a turn, way, manner, style, a trope or figure of speech, a mode in music, a mode or mood in logic”), from τροπή (tropḗ, “turn; solstice; trope”). Early use in botany as geotropism and heliotropism.