sac(redirected from Gestational sac)
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Variant of Sauk.
Strategic Air Command
A pouch or pouchlike structure in an organism, sometimes filled with fluid.
[French, bag, from Old French, from Latin saccus; see sack1.]
1. A sacrifice fly. Also called sac fly.
2. A sacrifice bunt. Also called sac bunt.
(Biology) a pouch, bag, or pouchlike part in an animal or plant
[C18: from French, from Latin saccus; see sack1]
(in Britain) abbreviation for
(Environmental Science) Special Area of Conservation
a baglike structure in an animal, plant, or fungus, esp. one containing fluid.
[1735–45; < Latin saccus sack1]
n., pl. Sacs, (esp. collectively) Sac.
Strategic Air Command.
A bag-like bag in an animal or plant, often containing liquids. The human bladder is a sac.
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|Noun||1.||sac - an enclosed space; "the trapped miners found a pocket of air"|
|2.||sac - a case or sheath especially a pollen sac or moss capsule|
|3.||Sac - a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay|
|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
saccule, sacculus - a small sac or pouch (especially the smaller chamber of the membranous labyrinth)
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
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