Definition of alveolus in English:

alveolus

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nounplural noun alveoli/-ˌlī/

  • 1Anatomy
    Any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.

    ‘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.’
    • ‘He found a major cause of bronchial asthma and many other chronic diseases to be a deficiency of carbon dioxide in the alveolus of our lungs.’
    • ‘Many alveoli in the functioning lung can remain at low volume for extended periods.’
    1. 1.1An acinus (saclike cavity) in a gland.
      • ‘Carbon dioxide in the lungs is 4.5 to 6%, in the blood of alveolus 6.5% and in cells 7%.’
  • 2Anatomy
    The bony socket for the root of a tooth.

    ‘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.’
    • ‘The tooth is two-rooted, with each root housed in its own alveolus.’
    • ‘These problems can be fixed by grafting bone matter onto the alveolus.’

Pronunciation

alveolus

/alˈvēələs/ /ælˈviələs/

Origin

Late 17th century from Latin, ‘small cavity’, diminutive of alveus.