What is the meaning of grain?

noun

• A relatively small granular particle of a substance.
  • usage: "a grain of sand"; "a grain of sugar"
• Foodstuff prepared from the starchy grains of cereal grasses.
  • synonyms: food grain, cereal
• The side of leather from which the hair has been removed.
• A weight unit used for pearls or diamonds: 50 mg or 1/4 carat.
  • synonyms: metric grain
• 1/60 dram; equals an avoirdupois grain or 64. 799 milligrams.
• 1/7000 pound; equals a troy grain or 64. 799 milligrams.
• Dry seed-like fruit produced by the cereal grasses: e. G. Wheat, barley, Indian corn.
  • synonyms: caryopsis
• A cereal grass.
  • usage: "wheat is a grain that is grown in Kansas"
• The smallest possible unit of anything.
  • usage: "there was a grain of truth in what he said"; "he does not have a grain of sense"
• The direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric.
  • usage: "saw the board across the grain"
• The physical composition of something (especially with respect to the size and shape of the small constituents of a substance. )
  • usage: "breadfruit has the same texture as bread"; "sand of a fine grain"; "fish with a delicate flavor and texture"; "a stone of coarse grain"
  • synonyms: texture

verb

• Thoroughly work in.
  • usage: "His hands were grained with dirt"
  • synonyms: ingrain
• Paint (a surface) to make it look like stone or wood.
• Form into grains.
  • synonyms: granulate
• Become granular.
  • synonyms: granulate