1. grain (the seed of various grass food crops)

2. grain, seed, kernel, bean (a single seed of certain crops)

3. grain (a single similar particle of various substances)

4. pimple, blackhead (a blocked skin pore, typically inflamed, painful, and filled with pus)

5. point (the main intent or focus of a conversation) (figurative, figuratively)

6. grain (the linear texture of a material or surface, especially wood)

7. grain (flawed visual texture present in most processed photographic film) (photography)

8. grano, Spanish grain (a traditional small unit of mass, equivalent to about 50 mg) (historical)

9. grain (any of various traditional units of mass notionally based on the weight of different grains) (historical)