Significat

1. grain, the seed of various grass crops
2. grain, seed, kernel, bean, a single seed of certain crops
3. grain, a similar single particle of various substances
4. grain, the linear surface texture of various substances, particularly wood
5. pimple, blackhead, a blocked skin pore, especially with a painful and pus-filled inflamation
6. grano, Spanish grain, a traditional unit of mass, equivalent to about 50 mg
7. grain, other units of measure notionally based on the weight of various grains