AIR SACS

air sacs: translation

1. (ARTHROPODA: Insecta)

Pouch-like enlargements of tracheal tubes in winged forms, usually lacking taenidia, capable of inflation and thought to function as an aid in flight and to lessen specific gravity.

2. (CNIDARIA: Hydrozoa)

In Siphonophora, that portion of a pneumatophore that contains gas.