English > sac: 4 senses > noun 4, body| Meaning | A structure resembling a bag in an animal. |
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| Narrower | acinus | One of the small sacs or saclike dilations in a compound gland |
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| 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 |
| alveolus, air sac, air cell | A tiny sac for holding air in the lungs |
| amnion, amniotic sac, amnios | Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) |
| bladder, vesica | A distensible membranous sac (usually containing liquid / liquid or gas) |
| bursa | A small fluid-filled sac located between movable parts of the body especially at joints |
| chorion | The outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) |
| cisterna, cistern | A sac or cavity containing fluid especially lymph or cerebrospinal fluid |
| coelenteron | The saclike body cavity of a coelenterate |
| pericardial sac | The membrane surrounding the heart |
| pouch, pocket | (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican) |
| saccule, sacculus | A small sac or pouch (especially the smaller chamber of the membranous labyrinth) |
| vesicle, cyst | A small anatomically normal sac or bladderlike structure (especially one containing fluid) |
| yolk sac | membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes |
| yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus | membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional |
| Broader | cavity, bodily cavity, cavum | (anatomy) a natural hollow or sinus / sinus within the body |
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| Spanish | saco |
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| Catalan | sac |
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