Alveolus (pl. alveoli, adj. alveolar) is a general anatomical term for a concave cavity or pit.

Alveolus may refer to:

In anatomy and zoology in general

• Pulmonary alveolus, an air sac in the lungs
• Alveolar gland
• Dental alveolus, also known as "tooth socket", a socket in the jaw that holds the roots of teeth
  • Alveolar ridge, the jaw structure that contains the dental alveoli
  • Alveolar canals
• arteries
  • Superior alveolar artery
    • Anterior superior alveolar arteries
    • Posterior superior alveolar artery
  • Inferior alveolar artery
• nerves
  • Anterior superior alveolar nerve
  • Middle superior alveolar nerve
  • Inferior alveolar nerve

In Botany, Microbiology, and related disciplines alveoli may be:

• Surface cavities or pits, such as on the stem of Myrmecodia species
• Pits on honeycombed surfaces such as receptacles of many Angiosperms, for example, many Asteraceae and Dipsacus
• Pits on the fruiting bodies of fungi such as Boletus or the ascocarps, especially the perithecia, of fungi such as typical Ascomycetes
• Pits on the valves of the tests of many Diatoms

In medicine

• Alveolar soft part sarcoma

In linguistics

• Alveolar consonant, a linguistic vocalization depending upon touching tongue to alveolar ridge
• Alveolar plosive

See also

• Acinus, considered by some (but not all) sources to be synonymous with Alveolus