Photoheliograph



[foh-tuh-hee-lee-uh-graf, -grahf] /ˌfoʊ təˈhi li əˌgræf, -ˌgrɑf/

noun, Astronomy.
1.
an instrument for photographing the sun, consisting of a camera and a specially adapted telescope.

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    photoinactivation pho·to·in·ac·ti·va·tion (fō’tō-ĭn-āk’tə-vā’shən) n. Inactivation, as of a substance, by light.

  • Photoinduced

    [foh-toh-in-doost, -dyoost] /ˌfoʊ toʊ ɪnˈdust, -ˈdyust/ adjective 1. by light.



  • Photoionization

    [foh-toh-ahy-uh-nuh-zey-shuh n] /ˌfoʊ toʊˌaɪ ə nəˈzeɪ ʃən/ noun, Physics. 1. the phenomenon in which the absorption of electromagnetic radiation by an atom in a gas induces the atom to emit a bound electron and thereby become ionized.

  • Photoisomerization

    [foh-toh-ahy-som-er-uh-zey-shuh n] /ˌfoʊ toʊ aɪˌsɒm ər əˈzeɪ ʃən/ noun, Chemistry. 1. isomerization induced by light.



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