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[foh-toh-tuh-pog-ruh-fee] /ˌfoʊ toʊ təˈpɒg rə fi/

topographical surveying employing photogrammetric methods.
the preparation of topographic maps from photographs


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  • Phototoxic

    /ˌfəʊtəʊˈtɒksɪk/ adjective 1. (of cosmetics, skin creams, etc) making the skin hazardously sensitive to sunlight phototoxic pho·to·tox·ic (fō’tō-tŏk’sĭk) adj. Rendering the skin susceptible to damage by light. Used of certain medications. pho’to·tox·ic’i·ty (-tŏk-sĭs’ĭ-tē) n.

  • Phototoxin

    [foh-tuh-tok-sin] /ˈfoʊ təˌtɒk sɪn/ noun 1. Biochemistry. a plant causing an allergic reaction when touched or eaten by a susceptible person or animal subsequently exposed to sunlight.

  • Phototransistor

    [foh-toh-tran-zis-ter] /ˌfoʊ toʊ trænˈzɪs tər/ noun, Electronics. 1. a that amplifies current induced by photoconductivity. /ˌfəʊtəʊtrænˈzɪstə/ noun 1. a junction transistor, whose base signal is generated by illumination of the base. The emitter current, and hence collector current, increases with the intensity of the light phototransistor (fō’tō-trān-zĭs’tər) A transistor that regulates current or switches it […]

  • Phototroph

    [foh-tuh-trof, -trohf] /ˈfoʊ təˌtrɒf, -ˌtroʊf/ noun, Biology. 1. any organism that uses light as its principal source of energy. /ˈfəʊtəʊˌtrɒf/ noun 1. an organism that obtains energy from sunlight for the synthesis of organic compounds phototroph (fō’tə-trŏf’) An organism that manufactures its own food from inorganic substances using light for energy. Green plants, certain algae, […]

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