1. 
   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 op http://www.encyclo.co.uk/webster/P/112
   
   
2. 
   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 op http://www.mondofacto.com/facts/dictionary?pneumatocyst
   
   
3. 
   Pneumatocyst
   • (n.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.
   Found op http://thinkexist.com/dictionary/meaning/pneumatocyst/
   
   
4. 
   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 equi...
   Found op http://en.wikipedia.org/wiki/Pneumatocyst
   
   

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