Dictionary of Human Evolution and Biology

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General anatomical term used to designate a small saclike structure.

1. a dental alveolus is one of the cavities in the alveolar process of the mandible or maxilla in which the roots of the tooth are held by the fibers of the periodontal ligament.

2. a pulmonary alveolus is one of the polyhedral outpouchings along the walls of the alveolar sacs and alveolar ducts through the walls of which alveolar gas and pulmonary capillary blood gas are exchanged. Plural: alveoli, alveolae.

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From "Dictionary of Nursing and Individual Health Care"