2.Definition: 1/7000 pound; equals a troy grain or 64.799 milligrams
3.Definition: a cereal grass
"Wheat is a grain that is grown in Kansas"
4.Definition: a relatively small granular particle of a substance
"A grain of sand", "A grain of sugar"
5.Definition: a weight unit used for pearls or diamonds: 50 mg or 1/4 carat
7.Definition: foodstuff prepared from the starchy grains of cereal grasses
9.Definition: the physical composition of something (especially with respect to the size and shape of the small constituents of a substance)
"Breadfruit has the same texture as bread", "Sand of a fine grain", "Fish with a delicate flavor and texture", "A stone of coarse grain"
10.Definition: the side of leather from which the hair has been removed
11.Definition: the smallest possible unit of anything
"There was a grain of truth in what he said", "He does not have a grain of sense"