noun, plural alveoli [al-vee-uh-lahy] .
a little cavity, pit, or cell, as a cell of a honeycomb.
an air cell of the lungs, formed by the terminal dilation of tiny air passageways.
one of the terminal secretory units of a racemose gland.
the socket within the jawbone in which the root or roots of a tooth are set.

1700–10; < Latin, equivalent to alve(us) concave vessel + -olus -ole1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alveolus (ælˈvɪələs)
n , pl -li
1.  any small pit, cavity, or saclike dilation, such as a honeycomb cell
2.  any of the sockets in which the roots of the teeth are embedded
3.  any of the tiny air sacs in the lungs at the end of the bronchioles, through which oxygen is taken into the blood
[C18: from Latin: a little hollow, diminutive of alveus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

alveolus al·ve·o·lus (āl-vē'ə-ləs)
n. pl. al·ve·o·li (-lī')
A small angular cavity or pit, such as a tooth socket or an air sac.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
alveolus   (āl-vē'ə-ləs)  Pronunciation Key 
Plural alveoli (āl-vē'ə-lī')
Any of the tiny air-filled sacs arranged in clusters in the lungs, in which the exchange of oxygen and carbon dioxide takes place. Also called air sac.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It flows in through increasingly small airways, finally filling tiny sacs called alveoli.
The alveoli tear and become larger sacs, trapping air, which becomes stale.
The major features of the lungs include the bronchi, the bronchioles and the alveoli.
Alveoli are the small sacs in the lungs that exchange oxygen with the blood.
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