Definitions:
wheat or any other cultivated cereal used as food.

a single fruit or seed of a cereal

the smallest unit of weight in the troy and avoirdupois systems, equal to 1/5760 of a pound troy and 1/7000 of a pound avoirdupois (approximately 0.0648 gram).

the longitudinal arrangement or pattern of fibres in wood, paper, etc.

a person's character or natural tendency.

kermes or cochineal, or dye made from either of these.

give a rough surface or texture to

paint (something, especially furniture or interior surfaces) in imitation of the grain of wood or marble

remove hair from (a hide).

feed (a horse) on grain.