Definition of alveolus in English:

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Pronunciation: /ˌalvɪˈəʊləs/
Pronunciation: /alˈvɪələs/

noun (plural alveoli /ˌalvɪˈəʊlʌɪ/ /alˈvɪəliː/)

chiefly Anatomy
1Any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.
Example sentences
  • Scientists also suspect that air pollutants might dampen the growth of alveoli, tiny air sacs in the lungs.
  • Holes in the lungs occur as the alveoli air sacs break down.
  • As altitude increases above sea level, atmospheric pressure drops with a parallel decrease in the amount of oxygen available at the blood/air interface in the lung alveolus.
2The bony socket for the root of a tooth.
Example sentences
  • No preserved teeth or alveoli can be observed in the premaxilla and dentary bones.
  • The tooth row is present throughout the entire preserved length of the jaw and possesses 16 teeth and empty alveoli.
  • Only a few, fragmentary teeth are preserved, and judging by the fragments and the size of alveoli, the teeth were gracile.



Pronunciation: /alvɪˈəʊlət/
Pronunciation: /alˈvɪələt/
Example sentences
  • The Siddall group addressed the molecular phylogeny of three, very similar, alveolate genera.
  • Several workers have suggested that the entire alveolate clade is derived from a photosynthetic ancestor.
  • One of them corresponded to an alveolate sequence belonging to the recently described marine.


Late 17th century: from Latin, 'small cavity', diminutive of alveus.

Words that rhyme with alveolus

Aeolus, bolas, bolus, gladiolus, holus-bolus, solus, toeless

For editors and proofreaders

Line breaks: al¦veo|lus

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