Dictionary - grain

gain noun

1. AGRICULTURE a seed or the seeds from cereal plants such as wheat, rice, or barley that are used for food, or barley that are used for food, or the plants that they grow on - picture --> CEREAL
2. a very small individual piece of a substance such as sand, salt, or suger
3. a very small amount of a quality or felling: There was more than a grain of truth in what he'd said.
4. the pattern or direction of th fibres in substances such as wood, cloth, or pater