P0268900 (fō-tŏt′rə-pĭz′əm, fō′tō-trō′-)n. Growth or movement of a sessile organism toward or away from a source of light.pho′to·tro′pic(fō′tə-trō′pĭk) adj.
pho•to•trop•ic
(ˌfoʊ təˈtrɒp ɪk, -ˈtroʊ pɪk)
adj. growing toward or away from the light. [1895–1900]pho`to•trop′i•cal•ly,adv. EncyclopediaSeephototropism