Meaning

1. grain (harvested seeds of various grass-related food crops)
2. bean, corn, grain, seed (edible seeds of certain crops other than cereals)
3. grain (single particle of a substance)
4. minor aggravation of mental or emotional states, traits, or properties
5. grain (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)