Found 1 items, similar to pneumatocyst.
English → English (gcide) Definition: Pneumatocyst Pneumatocyst \Pneu*mat"o*cyst\, n. [Pneumato- + cyst.] (Zo["o]l.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia. [1913 Webster]