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.
A theory or system of social reform which contemplates a complete reconstruction of society with a more just and equitable distribution of property and labor In popular usage the term is often employed to indicate any lawless revolutionary social scheme See Communism Fourierism Saint Simonianism forms of socialism...