from The Century Dictionary.
- noun The air-sac, float, or pneumatophore of an oceanic hydrozoan or siphonophorous hydromedu-san; one of the several appendages of the stem of these organisms, serving to buoy them in the water. See cuts under
- noun In ornithology, an air-sac or air-space; one of the cavities in a bird's body filled with air.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun zoology A
cystor sacof a siphonophore, containing airand serving as a float.
from Wiktionary, Creative Commons Attribution/Share-Alike License
pneumato- + cyst
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