[ noun ]
■ (anatomy) a natural hollow or sinus within the body
→
bodily cavity
,
cavity
,
cavum
[ noun ]
■ a tiny sac for holding air in the lungs
■ formed by the terminal dilation of tiny air passageways
→
air cell
,
air sac
,
alveolus
[ noun ]
■ space that is surrounded by something
→
cavity
,
enclosed space
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