| phototropic | -เคลื่อนเหตุแสง [แพทยศาสตร์ ๖ ส.ค. ๒๕๔๔] |
| phototrophic bacteria | (n) green and purple bacteria; energy for growth is derived from sunlight; carbon is derived from carbon dioxide or organic carbon, Syn. phototropic bacteria |
| Phototropic | a. [ Photo- + Gr. &unr_; to turn. ] (Bot.) of or pertaining to phototropism; exhibiting phototropism; same as Heliotropic. [ 1913 Webster ] |