Definition of alveolus
plural alveoli
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\-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
2
:teethridge
