alveolus
noun
al·ve·o·lus
al-ˈvē-ə-ləs
plural alveoli
al-ˈvē-ə-ˌlī
-(ˌ)lē
1
: a small cavity or pit: such as
a
: a socket in the jaw for a tooth
b
: a small air-containing compartment of the lungs in which the bronchioles terminate and from which respiratory gases are exchanged with the pulmonary capillaries
c
: an acinus of a compound gland
d
: a cell of a honeycomb
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Merriam-Webster unabridged
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