sac
sac / sak/ • n. a hollow, flexible structure resembling a bag or pouch: a fountain pen with an ink sac. ∎ a cavity enclosed by a membrane within a living organism, containing air, liquid, or solid structures.DERIVATIVES: sac·like adj.
sac
sac
sac (sak) n. a pouch or baglike structure. Sacs can enclose natural cavities in the body, e.g. in the lungs (see alveolus), or they can be pathological, as in a hernia.
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