(zoology) A muscular bag found in certain cephalopods used to generate ink.

(zoology) The sac in which the shell of a mollusc is secreted during development; (now especially) the fold of mantle in which a cephalopod secretes its pen or gladius.

Synonym of egg case

Alternative spelling of castor sac

an organ of a beaver releasing a secretion for refining the animal’s fell, popular in perfumery as under the name castoreum, and formerly in medicine

Part of the reproductive tract of cephalopods in which spermatophores are stored, opening into the left side of the mantle cavity.

(anatomy) Synonym of laryngeal saccule.

(anatomy) A portion of the peritoneal cavity that lies posterior to the stomach and the lesser omentum.

Alternative form of soc and sac

Synonym of pericardium