'Pneumatocyst' definitions:
Definition of '
Pneumatocyst
'
From:
GCIDE
Pneumatocyst \Pneu*mat"o*cyst\, n. [Pneumato- + cyst.] (Zool.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia. [1913 Webster]
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