air sac - WordReference.com Dictionary of English

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- - air mass
  - air mattress
  - air mile
  - air officer
  - air pistol
  - air plant
  - air pocket
  - air pump
  - air quality
  - air raid
  - air sac
  - air shot
  - air traffic control
  - air vice-marshal
  - air-dry
  - air-kiss
  - air-sea rescue
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  - airbag
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air sac

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Concise Oxford English Dictionary © 2008 Oxford University Press:
air sac

▶noun a lung compartment containing air; an alveolus.

■ an extension of a bird's lung cavity into a bone or other part of the body.

'air sac' also found in these Oxford entries:

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