What is the meaning of Pneumatocyst?

(n.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). pneumatocyst. Retrieved September 26, 2026, from http://smartdefine.org/pneumatocyst/definitions/2046749
ChicagoWebster's. 2011. "pneumatocyst" http://smartdefine.org/pneumatocyst/definitions/2046749 (accessed September 26, 2026).
HarvardWebster's 2011, pneumatocyst, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/pneumatocyst/definitions/2046749>.
MLAWebster's. "pneumatocyst" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/pneumatocyst/definitions/2046749>