• (RP) IPA: /ˌælviˈəʊləs/, /ælˈvi.ələs/, /ˈælvi.ələs/
  • (GA) IPA: /ælˈvi.ələs/, /ˌælviˈoʊləs/

alveolus (plural alveoli)

  1. A small cavity or pit.
  2. (anatomy) An anatomical structure that has the form of a hollow cavity, as:
    1. (anatomy, pulmonology) A small air sac in the lungs, where oxygen and carbon dioxide are gas exchange with the blood.
      Synonyms: pulmonary alveolus
    2. (anatomy, dentistry) A dental alveolus (tooth socket): the socket in which a tooth resides.
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