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The Collaborative International Dictionary of English v.0.48 (gcide)

Alveolus \Al*ve"o*lus\ ([a^]l*v[=e]"[-o]*l[u^]s), n.; pl.
{Alveoli} (-l[imac]). [L., a small hollow or cavity, dim. of
alveus: cf. F. alv['e]ole. See {Alveary}.]
1. A cell in a honeycomb.
[1913 Webster]

2. (Zool.) A small cavity in a coral, shell, or fossil.
[1913 Webster]

3. (Anat.) A small depression, sac, or vesicle, as the socket
of a tooth, the air cells of the lungs, the ultimate
saccules of glands, etc.
[1913 Webster]

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