Pneumatocyst

Pneu·mat'o·cyst noun [ Pneumato- + cyst .] (Zoology) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.
Found on http://www.encyclo.co.uk/webster/P/112

pneumatocyst

<zoology> A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia. ... Origin: Pneumato- + cyst. ... Source: Websters Dictionary ... (01 Mar 1998) ...
Found on http://www.mondofacto.com/facts/dictionary?pneumatocyst

Pneumatocyst

• (n.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.
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Pneumatocyst

In phycology, a pneumatocyst is a large float containing gas found in brown algae. An organism may have more than one. They provide buoyancy to lift the blades toward the surface, allowing them to receive more sunlight for photosynthesis. The proportion of gases in the pneumatocysts adjusts by equilibrating with the surrounding air or water. The p
Found on http://en.wikipedia.org/wiki/Pneumatocyst
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