Definitions from Wiktionary (alveolus)

▸ noun:  A small cavity or pit.
▸ noun:  (anatomy) Any of the many tiny air sacs in the lungs in which the bronchioles terminate and where oxygen and carbon dioxide are rapidly exchanged with the pulmonary capillaries.
▸ noun:  (anatomy, dentistry) The bony socket in which the root of a tooth resides.
▸ noun:  (anatomy) An acinus (saclike cavity) in a gland.
▸ noun:  (entomology) The socket of a macrotrichium (seta).





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