air sac Meaning in the Cambridge English Dictionary
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Meaning of “air sac” in the English Dictionary

"air sac" in British English

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air sacnoun [C]

uk   us   specialized
a ​spacefilled with ​air that ​continues from a bird's ​lungs into one of ​itsbones or another ​bodyarea, used in ​breathing a ​widepart like a ​bag in the ​tubes an ​insect uses for ​breathing an alveolus (= a very ​smallairbag in the ​lungs)
(Definition of air sac from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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