n. A small casing, envelop, covering, etc., natural or artificial, usually thin or membranous; a cover or container of some small object or quantity of matter. Specifically.n. In botany, a dehiscent pod or seed-vessel, either membranous or woody, composed of two or more carpels, which at maturity becomes dry and opens by regular valves corresponding in number to the carpels, or twice as numerous.n. In chem.: A small saucer made of clay for roasting samples of ores, or for melting them.n. A small shallow vessel made of Berlin ware, platinum, etc., for evaporations, solutions, and the like.n. In anatomy and zoology, a membrane or ligament inclosing some part or organ as in a bag or sac; a saccular envelop or investment: as, the capsule of the crystalline lens of the eye; the capsule of a joint, as the hip.n. In anatomy, some part or organ likened to a capsule: as, the adrenal capsules.n. In Protozoa, the included perforated test of a radiolarian.n. In entomology, a horny case inclosing the eggs of an insect, as those of the cockroach. Also called oötheca.n. A cap of thin metal, such as tin-foil, put over the mouth of a corked bottle to preserve the cork from drying.n. A small gelatinous case or envelop in which nauseous medicines are inclosed to be swallowed.n. The shell of a metallic cartridge or of a fulminating tube.To furnish (a bottle, medicinal powder, etc.) with a capsule.