n. 1 a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageway; 2 any of the membranous air-filled extensions of the lungs of birds
Birds ventilate their lungs by means of air sacs.
Birds ventilate their lungs by means of air sacs.
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alveolus; air cell; sac for holding air
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1 syllables
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