alveolus

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
noun a bony socket in the alveolar ridge that holds a tooth

Borrowed from Latin alveolus (“a small hollow or cavity”), diminutive of alveus (“a hollow, cavity”).

LUNGS: Sections through the grossly described area of contusion in the right upper lobe exhibit disruption of alveolar walls and recent hemorrhage into alveoli. — Report of the President's Commission on the Assassination of President John F. Kennedy, United States. Warren Commission
[12] If, in a froth of the same kind, the air is extracted from an alveolus, a cone of attraction is seen to form, like those about the centrosomes which result in the division of the nucleus. — Creative Evolution, Bergson, Henri

air sac, air cell

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