| sac | | |
| n. (shape) | 1. pocket, pouch, sac, sack | an enclosed space.; "the trapped miners found a pocket of air" |
| ~ enclosed space, cavity | space that is surrounded by something. |
| n. (plant) | 2. sac, theca | a case or sheath especially a pollen sac or moss capsule. |
| ~ covering, natural covering, cover | a natural object that covers or envelops.; "under a covering of dust"; "the fox was flushed from its cover" |
| n. (person) | 3. sac, sauk | a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay. |
| ~ algonquian, algonquin | a member of any of the North American Indian groups speaking an Algonquian language and originally living in the subarctic regions of eastern Canada; many Algonquian tribes migrated south into the woodlands from the Mississippi River to the Atlantic coast. |
| ~ black hawk, makataimeshekiakiak | Sauk leader who in 1832 led Fox and Sauk warriors against the United States (1767-1838). |
| ~ keokuk | Sauk leader who aided the United States against Black Hawk (1790-1848). |
| n. (body) | 4. sac | a structure resembling a bag in an animal. |
| ~ yolk sac | membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo. |
| ~ umbilical vesicle, vesicula umbilicus, vitelline sac, yolk sac | membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional. |
| ~ amnion, amnios, amniotic sac | thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals). |
| ~ chorion | the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals). |
| ~ coelenteron | the saclike body cavity of a coelenterate. |
| ~ air bladder, swim bladder, float | an air-filled sac near the spinal column in many fishes that helps maintain buoyancy. |
| ~ air sac | any of the membranous air-filled extensions of the lungs of birds. |
| ~ air sac | any of the thin-walled extensions of the tracheae of insects. |
| ~ bodily cavity, cavum, cavity | (anatomy) a natural hollow or sinus within the body. |
| ~ saccule, sacculus | a small sac or pouch (especially the smaller chamber of the membranous labyrinth). |
| ~ bladder, vesica | a distensible membranous sac (usually containing liquid or gas). |
| ~ acinus | one of the small sacs or saclike dilations in a compound gland. |
| ~ bursa | a small fluid-filled sac located between movable parts of the body especially at joints. |
| ~ cistern, cisterna | a sac or cavity containing fluid especially lymph or cerebrospinal fluid. |
| ~ pouch, pocket | (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican). |
| ~ vesicle, cyst | a small anatomically normal sac or bladderlike structure (especially one containing fluid). |
| ~ air cell, air sac, alveolus | a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways. |
| ~ pericardial sac | the membrane surrounding the heart. |
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