A'IR-SACS, noun Air bags in birds, which are certain receptacles of air, or vesicles lodged in the fleshy parts, in the hollow bones and in the abdomen, which all communicate with the lungs. These are supposed to render the body specifically lighter, and to supply the place of a muscular diaphragm.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.