PHOTOTROPISM Meaning of PHOTOTROPISM in English [ ˌfəʊtə(ʊ)'trəʊpɪz(ə)m , fəʊ'tɒtrəˌpɪz(ə)m ]■ noun Biology the orientation of a plant or other organism in response to light.Derivativesphototropic adjective Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004