(physiology) A membranous envelope.

(botany) A type of simple, dehiscent, dry fruit (seed-case) produced by many species of flowering plants, such as poppy, lily, orchid, willow and cotton.

(botany) A sporangium, especially in bryophytes.

(anatomy) A tough, fibrous layer surrounding an organ such as the kidney or liver

(anatomy) A membrane that surrounds the eyeball

(astronautics) A detachable part of a rocket or spacecraft (usually in the nose) containing the crew's living space.

(pharmacy) A small container containing a dose of medicine.

(attributively, figurative) in a brief, condensed or compact form

(winemaking) The covering — formerly lead or tin, now often plastic — over the cork at the top of the wine bottle.

A small, shallow evaporating dish, usually of porcelain.

A small cup or shell, often of metal, for a percussion cap, cartridge, etc.

One of the very small rooms for guests in a capsule hotel.

(transitive) To form (medicine, etc.) into capsules.

(transitive) To encapsulate or summarize.