air sac
ˈair ˌsac noun [C] SPECIALIZED
1 F0 a space filled with air that continues from a bird's lungs into one of its bones or another body area, used in breathing Thesaurus+: ↑Substances and structures in the bodyThesaurus+: ↑The respiratory system2 F0 a wide part like a bag in the tubes an insect uses for breathing Thesaurus+: ↑Substances and structures in the bodyThesaurus+: ↑The respiratory system3 F0 an alveolus (= a very small air bag in the lungs) Thesaurus+: ↑Substances and structures in the bodyThesaurus+: ↑The respiratory system |