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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