Pathology . a closed, bladderlike sac formed in animal tissues, containing fluid or semifluid matter.

a bladder, sac, or vesicle.

Botany, Mycology .

a sporelike cell with a resistant, protective wall.

a cell or cavity enclosing reproductive bodies.

Zoology .

a sac, usually spherical, surrounding an animal that has passed into a dormant condition.

such a sac plus the contained animal.

a capsule or resistant covering.

noun

bag , bleb , blister , injury , pouch , sac , sore , vesicle , wen , spore