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definition of the word alveolus

by the Wiktionnary

Singular
alveolus

Plural
alveoli

alveolus (plural alveoli)

  1. A small cavity or pit.
  2. (anatomy) an anatomical structure that has the form of a hollow cavity
  3. (anatomy) a small air sac in the lungs, where oxygen and carbon dioxide are exchanged with the blood.

(air sac in lung):


Definition from Wiktionary
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