Grain is the concentrated edible product at the heart of cereal farming, gathered, dried, stored, milled, traded, and eaten. Because individual grains are tiny yet collectively sustain communities, poets use them to explore scale, abundance, mortality, and value. Grain can symbolise nourishment, seed, wealth, sacrifice, or the fruits of labour. Its burial in soil and rebirth as a crop also support images of resurrection. Spilled or rotting grain may represent waste, famine, failed stewardship, or the fragility of prosperity.

Grain may refer collectively to cereal seeds or to an individual seed of wheat, barley, oats, rye, or another cereal. In poetry, its small size and immense collective value make it a natural symbol of humble beginnings, nourishment, fertility, and accumulated abundance. The burial of grain before germination can suggest death and resurrection. Related terms include cereal, seed, wheat, barley, granary, threshing, chaff, milling, flour, and harvest.