Definition of alveolus
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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Time Traveler for alveolus
The first known use of alveolus was in 1657
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