- a baglike structure in an animal, plant, or fungus, as one containing fluid.
- a pouch, bag, or pouchlike part in an animal or plant
abbreviation for (in Britain)
- Special Area of Conservation
n.“biological pocket,” 1741, from French sac, from Latin saccus “bag” (see sack (n.1)). central Algonquian people who lived near the upper Mississippi before the Black Hawk War of 1832, from French Canadian Saki, probably a shortened borrowing of Ojibwa (Algonquian) /osa:ki:/, literally “person of the outlet” (of the Saginaw River, which itself contains their name, and means literally “in the Sauk country”). n.
- A pouch or bursa.
- An encysted abscess at the root of a tooth.
- The capsule of a tumor or the envelope of a cyst.
- A pouch or pouch-shaped structure in an animal or plant, often containing liquids. The human bladder is a sac.