air sac

noun

An alveolus.

Similar
alveolusair cell
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Meanings

nounair sac (plural air sacs)

plural air sacs

  1. An alveolus.
  2. An extension of a lung of some birds.

Synonyms & antonyms

nouna tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

Similar
alveolusair cell
Broader
sac
Also see
air cellalveolus

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

air sac. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/air%20sac

MLA

“air sac.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/air%20sac. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “air sac,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/air%20sac.

Source: air sac on Wiktionary, CC BY-SA 4.0.