grain

(uncountable) The harvested seeds of various grass food crops eg: wheat, corn, barley.

(uncountable); Similar seeds from any food crop, e.g., buckwheat, amaranth, quinoa.

(countable) A single seed of grass food crops.

(countable, uncountable) The crops from which grain is harvested.

(uncountable) A linear texture of a material or surface.

(countable) A single particle of a substance.

(countable) A very small unit of weight, in England equal to ¹⁄₄₈₀ of an ounce troy, 0.0648 grams or, to be more exact, 64.79891 milligrams (0.002285714 avoirdupois ounce). A carat grain or pearl grain is ¹⁄₄ carat or 50 milligrams. The old French grain was ¹⁄₉₂₁₆ livre or 53.11 milligrams, and in the mesures usuelles permitted from 1812 to 1839, with the livre redefined as 500 grams, it was 54.25 milligrams.

(countable) A former unit of gold purity, also known as carat grain, equal to ¹⁄₄ "carat" (karat).

(materials) A region within a material having a single crystal structure or direction.

(astronautics) 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.

(in the plural) The remains of grain, etc., after brewing or distillation; hence, any residuum. Also called draff.

(botany) A rounded prominence on the back of a sepal, as in the common dock.

Temper; natural disposition; inclination.

(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.