grain Definition in Cambridge British English Dictionary
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Definition of "grain" - British English Dictionary

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grainnoun

uk   us   /ɡreɪn/

grain noun (SEED)

C2 [C or U] a seed or seeds from a plant, especially a plant like a grass such as rice or wheat: grains of wheat/rice Grain (= the crop from food plants like grasses) is one of the main exports of the American Midwest.
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grain noun (SMALL PIECE)

C2 [C] a very small piece of a hard substance: grains of sandC2 [S] a very small amount of a particular quality: There wasn't a grain of truth in anything she said. Anyone with a grain of common sense would have known what to do.

grain noun (PHOTOGRAPH)

[C or U] 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 film

grain noun (WOOD/CLOTH)

the grain [S] the natural patterns of lines in the surface of wood or cloth: to cut something along/against the grain

grain noun (WEIGHT)

[C] old-fashioned a unit of mass, equal to 0.0648 grams
(Definition of grain from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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