01 n. A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.
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1.
A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.(Zool.)
Entry
1 sense
Webster, 1913
Pneumatocyst
· Pneu·mat·o·cyst
· IPA