Photosystem
/ˈfəʊtəʊˌsɪstəm/
noun
1.
(botany) either of two pigment-containing systems, photosystem I or II, in which the light-dependent chemical reactions of photosynthesis occur in the chloroplasts of plants
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[foh-tuh-tak-sis] /ˌfoʊ təˈtæk sɪs/ noun, Biology. 1. movement of an organism toward or away from a source of light. /ˌfəʊtəʊˈtæksɪs/ noun 1. the movement of an entire organism in response to light phototaxis pho·to·tax·is (fō’tō-tāk’sĭs) n. The movement of an organism or a cell toward or away from a source of light. pho’to·tac’tic (-tāk’tĭk) adj.
- Phototaxis
[foh-tuh-tak-sis] /ˌfoʊ təˈtæk sɪs/ noun, Biology. 1. movement of an organism toward or away from a source of light. /ˌfəʊtəʊˈtæksɪs/ noun 1. the movement of an entire organism in response to light phototaxis pho·to·tax·is (fō’tō-tāk’sĭs) n. The movement of an organism or a cell toward or away from a source of light. pho’to·tac’tic (-tāk’tĭk) adj.
- Phototelegraphy
[foh-toh-tuh-leg-ruh-fee] /ˌfoʊ toʊ təˈlɛg rə fi/ noun 1. (def 2a).
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[foh-toh-thee-od-l-ahyt] /ˌfoʊ toʊ θiˈɒd lˌaɪt/ noun 1. an optical tracking instrument consisting of a camera and mounted on a single tripod, used in photogrammetry and in tracking rockets.
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[foh-tuh-ther-uh-pyoo-tiks] /ˌfoʊ təˌθɛr əˈpyu tɪks/ noun, (used with a singular verb) 1. the branch of that deals with the curative use of light rays.