B2 [C or U] a small, round, or oval object produced by a plant and from which, when it is planted, a new plant can grow: Sow the seeds (= put them in the ground) about three centimetres deep. The chemical will stop all seeds from sprouting (= starting to grow). The farmers grow these crops for seed (= for planting to grow more crops, rather than for eating).Fruits and seeds and their parts › [U] literary → semenBodily fluids and their productionUrine and urinating go/run to seed › If a food plant goes or runs to seed, it produces flowers and seeds because it has not been picked early enough: In hot weather lettuces can suddenly run to seed.Decaying and staying fresh › If a person or place goes or runs to seed, their physical appearance becomes worse because no one cares for them: After he retired, he really went to seed.Deteriorating and making worse