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English definition of “grain”

grain

noun [C or U] (PHOTOGRAPH)    /ɡreɪn/
the pattern of extremely small spots of black and white or colour, or any of the separate spots, which form a photographic or film image: fine/coarse-grain filmPhotography
(Definition of grain noun (PHOTOGRAPH) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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