pneumatocyst definition

  • noun:
    • A cyst or sac of a siphonophore, containing environment and serving as a float.
    • A cyst or sac of a siphonophore, containing air, and serving as a float, as with Physalia.
    • The air-sac, float, or pneumatophore of an oceanic hydrozoan or siphonophorous hydromedu-san; one of the a few appendages of this stem among these organisms, offering to buoy all of them in liquid. See cuts under Athorybia and Hydrozoa.
    • In ornithology, an air-sac or air-space; among the cavities in a bird's human body full of air.
65 votes

How would you define pneumatocyst?

All the definitions on AZdictionary were written by people just like you. Now's your chance to add your own!