1. the mature ovule of a flowering plant.
2. semen.
3. a small cylindrical shell of gold or other suitable material, used in application of radiation therapy.
4. to inoculate a culture medium with microorganisms.
- s. dressing — chemicals mixed with seed grain to prevent infestion with insects and rodents and infection by fungi. Most are poisonous to animals and deaths may occur if the grain is not used as seed and is put back into the animal feed chain. The amount of feed in a collection of seed is usually very large and the probability is that it would be fed without dilution which would reduce its toxicity. Grain or grain products are also used as bait for birds, or to repel birds and to poison snails and other garden pests and all of them may be accessible to animals.
- s. grain — cereal grain intended to be used as seed for a crop.
- s. mixtures — mixtures of small grass and cereal seeds used as feed for companion birds. Some of the seeds used are the millets, chopped oat groats, canary grass (Phalaris spp.) seed, sunflower seed, hemp seed, rape seed.
- plantago s., plantain s., psyllium s. — cleaned, dried ripe seed of species of Plantago; used as a cathartic.
- radon s. — a small sealed container for radon, for insertion into the tissues of the body in radiotherapy.
- s. tick — larval form, the stage prior to the nymph.
