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ALVEOLUS
alveolus, air sac, air cell
(noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
Source: WordNet® 3.1
Etymology
Noun
alveolus (plural alveoli)
A small cavity or pit.
(anatomy) An anatomical structure that has the form of a hollow cavity, as
(anatomy, pulmonology) A small air sac in the lungs, where oxygen and carbon dioxide are exchanged with the blood.
Synonym: pulmonary alveolus
(anatomy, dentistry) A dental alveolus (tooth socket): the socket in which a tooth resides.
(entomology) The socket of a macrotrichium (seta).
Source: Wiktionary
Al*ve"o*lus, n.; pl. Alveoli. Etym: [L., a small hollow or cavity, dim. of alveus: cf. F. alvéole. See Alveary.]
1. A cell in a honeycomb.
2. (Zoöl.)
Definition: A small cavity in a coral, shell, or fossil
3. (Anat.)
Definition: A small depression, sac, or vesicle, as the socket of a tooth, the air cells of the lungs, the ultimate saccules of glands, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition
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