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[foh-toh-ahy-uh-nuh-zey-shuh n] /ˌfoʊ toʊˌaɪ ə nəˈzeɪ ʃən/

noun, Physics.
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.


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  • Photoisomerization

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

  • Photojournalism

    [foh-toh-jur-nl-iz-uh m] /ˌfoʊ toʊˈdʒɜr nlˌɪz əm/ noun 1. in which photography dominates written copy, as in certain magazines. 2. news photography, whether or not for primarily pictorial media, publications, or stories. /ˌfəʊtəʊˈdʒɜːnəˌlɪzəm/ noun 1. journalism in which photographs are the predominant feature n. 1944, from photo- + journalism. Related: Photojournalist.

  • Photokinesis

    [foh-toh-ki-nee-sis, -kahy-] /ˌfoʊ toʊ kɪˈni sɪs, -kaɪ-/ noun, Physiology. 1. movement occurring upon exposure to light. /ˌfəʊtəʊkɪˈniːsɪs; -kaɪ-/ noun 1. (biology) the movement of an organism in response to the stimulus of light

  • Photo-layout

    noun 1. a picture spread. See under (def 33).

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