An alveolus / An extension of a lung of some birds

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

Synonym of egg case

Alternative spelling of lacrimal sac

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.

Alternative form of soc and sac

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