D defs.my
Entry 3 senses Webster, 1913

Alveolus

/(ăl*vē"ō̇*lŭs)/ · Al·ve·o·lus · IPA /ælˈvi.əl.əs/
01 n. A cell in a honeycomb.
pl. Alveoli ((-lī))
  1. 1.
    A cell in a honeycomb.
  2. 2.
    A small cavity in a coral, shell, or fossil(Zool.)
  3. 3.
    A small depression, sac, or vesicle, as the socket of a tooth, the air cells of the lungs, the ultimate saccules of glands, etc.(Anat.)