Medical Dictionary


noun \ˈgrān\

Medical Definition of GRAIN

a :  a seed or fruit of a cereal grass b :  the seeds or fruits of various food plants including the cereal grasses and in commercial and statutory usage other plants (as the soybean) c :  plants producing grain
:  a small hard particle or crystal (as of sand or salt)
:  a unit of avoirdupois, Troy, and apothecaries' weight equal to 0.0648 gram or 0.002286 avoirdupois ounce or 0.002083 Troy ounce—abbreviation gr
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