Definitions from Wiktionary ( )

▸ noun:  (uncountable) The harvested seeds of various grass food crops eg: wheat, corn, barley.
▸ noun:  (uncountable) Similar seeds from any food crop, e.g., buckwheat, amaranth, quinoa.
▸ noun:  (countable) A single seed of grass food crops.
▸ noun:  (countable, uncountable) The crops from which grain is harvested.
▸ noun:  (uncountable) A linear texture of a material or surface.
▸ noun:  (countable) A single particle of a substance.
▸ noun:  (countable) Any of various small units of mass originally notionally based on grain's weight, variously standardized at different places and times, including
▸ noun:  The English grain of ¹⁄₅₇₆₀ troy pound or ¹⁄₇₀₀₀ pound avoirdupois, now exactly 64.79891 mg.
▸ noun:  The metric, carat, or pearl grain of ¹⁄₄ carat used for measuring precious stones and pearls, now exactly 50 mg.
▸ noun:  (historical) The French grain of ¹⁄₉₂₁₆ livre, equivalent to 53.11 mg at metricization and equal to exactly 54.25 mg from 1812–1839 as part of the mesures usuelles.
▸ noun:  (countable, chiefly historical) Any of various small units of length originally notionally based on a grain's width, variously standardized at different places and times.
▸ noun:  (countable, historical) The carat grain of ¹⁄₄ carat as a measure of gold purity, creating a 96-point scale between 0% and 100% purity.
▸ noun:  (materials) A region within a material having a single crystal structure or direction.
▸ noun:  (astronautics) The solid piece of fuel in an individual solid-fuel rocket engine.
▸ noun:  A reddish dye made from the coccus insect, or kermes; hence, a red color of any tint or hue, as crimson, scarlet, etc.; sometimes used by the poets as equivalent to Tyrian purple.
▸ noun:  The hair side of a piece of leather, or the marking on that side.
▸ noun:  (in the plural) The remains of grain, etc., after brewing or distillation; hence, any residuum.
▸ noun:  (botany) A rounded prominence on the back of a sepal, as in the common dock.
▸ noun:  Temper; natural disposition; inclination.
▸ noun:  (photography, videography) Visual texture in processed photographic film due to the presence of small particles of a metallic silver, or dye clouds, developed from silver halide that have received enough photons.
▸ verb:  To feed grain to.
▸ verb:  (transitive) To make granular; to form into grains.
▸ verb:  (intransitive) To form grains, or to assume a granular form, as the result of crystallization; to granulate.
▸ verb:  To texture a surface in imitation of the grain of a substance such as wood.
▸ verb:  (tanning) To remove the hair or fat from a skin.
▸ verb:  (tanning) To soften leather.
▸ verb:  To yield fruit.
▸ noun:  A branch of a tree; a stalk or stem of a plant; an offshoot.
▸ noun:  A tine, prong, or fork.
▸ noun:  One of the branches of a valley or river.
▸ noun:  An iron fish spear or harpoon, with a number of points half-barbed inwardly.
▸ noun:  A blade of a sword, knife, etc.
▸ noun:  An arm of a cross.
▸ noun:  (founding) A thin piece of metal, used in a mould to steady a core.
▸ noun:  (dialectal) A branch or arm of a stream, inlet, or sea.
▸ noun:  (dialectal) A fork in a river valley or ravine.
▸ noun:  (dialectal) The branch of a family; clan.
▸ noun:  (dialectal, anatomy) The groin; crotch.
▸ noun:  (dialectal, anatomy) The fangs of a tooth.
▸ noun:  A village on the Isle of Grain, Medway borough, Kent, England (OS grid ref TQ8876).
▸ noun:  A surname.

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