The harvested seeds of various grass food crops, especially wheat, maize, rye, barley, and rice. • Similar seeds from any food crop, e.g., buckwheat, amaranth, quinoa. • A single seed of a food crop, especially a cereal grass crop. • The crops from which grain is harvested. • A linear texture of a material or surface. • A single particle of a substance. • Any of various small units of mass originally notionally based on grain's weight, variously standardized at different places and times, including • The English grain of ¹⁄₅₇₆₀ troy pound or ¹⁄₇₀₀₀ pound avoirdupois, now exactly 64.79891 mg. • The metric, carat, or pearl grain of ¹⁄₄ carat used for measuring precious stones and pearls, now exactly 50 mg. • 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. • Any of various small units of length originally notionally based on a grain's width, variously standardized at different places and times. • The carat grain of ¹⁄₄ carat as a measure of gold purity, creating a 96-point scale between 0% and 100% purity. • A region within a material having a single crystal structure or direction. • The solid piece of fuel in an individual solid-fuel rocket engine. • 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. • The hair side of a piece of leather, or the marking on that side. • The remains of grain, etc., after brewing or distillation; hence, any residuum. • A rounded prominence on the back of a sepal, as in the common dock. • Temper; natural disposition; inclination. • 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. • A tiny fragment of a digital audio recording, used in granular synthesis to create new sounds or textures.