Definitions

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 Athorybia and Hydrozoa.
  • 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 cyst or sac of a siphonophore, containing air and serving as a float.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pneumato- +‎ cyst

Examples

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Comments

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  • Pneumatocysts also exist in Phaeophyceae (brown algae). Brown algae include kelp.

    February 6, 2012