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/alˈvēələs/ Noun, pl. alveoli 1. (Anatomy) An anatomical structure that has the form of a hollow cavity. ( 2. (Anatomy) A small air sac in the lungs, where oxygen and carbon dioxide are exchanged with the blood. ( 2. A small cell containing air in the lungs, a sac-like dilation of the alveolar ducts in the lung. ( 3. Any of the many tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place. (Google Dictionary) Word origin: From Latin alveolus, a diminutive of alveus (“a tray, trough, basin”), from alvus (“the belly, the stomach, bowels, womb,...

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