noun (chem)
an alteration in the colour of certain substances as a result of being exposed to light of different wavelengths
the reversible loss of colour of certain dyestuffs when illuminated at a particular wavelength


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    [foh-tuh-toob, -tyoob] /ˈfoʊ təˌtub, -ˌtyub/ noun, Electronics. 1. an with a photosensitive cathode, used like a photocell. /ˈfəʊtəʊˌtjuːb/ noun 1. a type of photocell in which radiation falling on a photocathode causes electrons to flow to an anode and thus produce an electric current

  • Phototype

    [foh-tuh-tahyp] /ˈfoʊ təˌtaɪp/ noun, Printing. 1. a plate with a relief printing surface produced by photography. 2. any process for making such a plate. 3. a print made from it. /ˈfəʊtəʊˌtaɪp/ noun 1. verb 2. (transitive) to reproduce (an illustration) using a phototype

  • Phototypesetting

    [foh-toh-tahyp-set-ing] /ˌfoʊ toʊˈtaɪpˌsɛt ɪŋ/ noun 1. Printing. . /ˌfəʊtəʊˈtaɪpˌsɛtɪŋ/ noun 1. (printing) another word for photocomposition

  • Phototypeset

    /ˌfəʊtəʊˈtaɪpˌsɛt/ verb -sets, -setting, -set 1. (transitive) to set (type matter) by phototypesetting

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