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(pl. alveoli)

1 The tiny air sac in the lung of mammals and reptiles at the end of each bronchiole. It is lined by a delicate moist membrane, has many blood capillaries, and is the site of exchange of respiratory gases (carbon dioxide and oxygen).

2 The socket in the jawbone in which a tooth is rooted by means of the periodontal membrane.

Subjects: Medicine and Health — Biological Sciences.

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