air sacnoun [ C ]
uk/ˈeə ˌsæk/us/ˈer ˌsæk/specializeda space filled with air that continues from a bird's lungs into one of its bones or another body area, used in breathing
a wide part like a bag in the tubes an insect uses for breathing
an alveolus (= a very small air bag in the lungs)
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Substances & structures in the body
- abductor
- accessorius
- adductor
- agonist
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- gyrus
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- hilus
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- peptic
- periosteum
- peritoneal
- peritoneum
- phosphatase
- vitreous humour
- xiphoid
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Animal physiology: the respiratory system