air sac meaning in Hindi

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Facial air sacs under their skin cushion the impact with the water.
Although birds have lungs they rely mostly on air sacs for ventilation.
They use these air sacs to migrate up and down in lakes.
Their skulls contain special air sacs that protect the brain from enormous pressure.
So far no evidence of air sacs has been found in ornithischian dinosaurs.
There are subcutaneous air sacs in the lower body and along the sides.
The pollen grains are round and do not possess wings or air sacs.
A pair of large resonating air sacs in the abdomen amplifies the sound.
Mites were recovered from the autosomal air sacs of bumble bees.
Sounds also bounce off the skull and air sacs that surround the melon.

noun.

any of the membranous air-filled extensions of the lungs of birds
any of the thin-walled extensions of the tracheae of insects
a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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