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alveoli

1) Tiny air sacs at the end of the bronchioles in the lungs.

2) A small cavity or pit: as a) a socket in the jaw for a tooth; b) any of the small thin-walled air-containing compartments of the lung that are typically arranged in saclike clusters into which an alveolar duct terminates and from which respiratory gases are exchanged with the pulmonary capillaries; c) an acinus of a compound gland; d) any of the pits in the wall of the stomach into which the glands open.

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