a: a membrane or saclike structure enclosing a part or organ <the capsule of the kidney>b: either of two layers or laminae of white matter in the cerebrum: (1): a layer that consists largely of fibers passing to and from the cerebral cortex and that lies internal to the lentiform nucleus—called also internal capsule(2): one that lies between the lentiform nucleus and the claustrum—called also external capsule
: a shell usually of gelatin for packaging something (as a drug or vitamins); also: a usually medicinal or nutritional preparation for oral use consisting of the shell and its contents
: a viscous or gelatinous often polysaccharide envelope surrounding certain microscopic organisms (as the pneumococcus)
Illustration of CAPSULE
In botany, a dry fruit that opens when ripe. It splits from top to bottom into separate segments known as valves, as in the iris, or forms pores at the top (e.g., poppy), or splits around the circumference, with the top falling off (e.g., pigweed and plantain). The spore-forming organ (seesporophyte) of liverworts and mosses is also called a capsule.