Photo-



1.
a combining form meaning “light” (photobiology); also used to represent “photographic” or “photograph” in the formation of compound words:
photocopy.
combining form
1.
of, relating to, or produced by light: photosynthesis
2.
indicating a photographic process: photolithography

word-forming element meaning “light” or “photographic” or “photoelectric,” from Greek photo-, comb. form of phos (genitive photos) “light,” from PIE root *bha- “to shine” (see phantasm).

photo- or phot-
pref.

photo-
A prefix that means “light,” as in photoreceptor.

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  • Photoactivation

    [foh-toh-ak-tuh-vey-shuh n] /ˌfoʊ toʊˌæk təˈveɪ ʃən/ noun, Chemistry. 1. the activation or control of a chemical, chemical reaction, or organism by light, as the activation of chlorophyll by sunlight during photosynthesis.

  • Photoactive

    [foh-toh-ak-tuh-vey-shuh n] /ˌfoʊ toʊˌæk təˈveɪ ʃən/ noun, Chemistry. 1. the activation or control of a chemical, chemical reaction, or organism by light, as the activation of chlorophyll by sunlight during photosynthesis. /ˌfəʊtəʊˈæktɪv/ adjective 1. (of a substance) capable of responding to light or other electromagnetic radiation



  • Photoaging

    [foh-toh-ey-jing] /ˌfoʊ toʊˈeɪ dʒɪŋ/ noun 1. damage to the skin, as wrinkles or discoloration, caused by prolonged exposure to sunlight.

  • Photoallergic

    [foh-toh-uh-lur-jik] /ˌfoʊ toʊ əˈlɜr dʒɪk/ adjective 1. .



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