What is the meaning of Physograde?

(n.) Any siphonophore which has an air sac for a float, as the Physalia.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). physograde. Retrieved September 28, 2026, from http://smartdefine.org/physograde/definitions/2045208
ChicagoWebster's. 2011. "physograde" http://smartdefine.org/physograde/definitions/2045208 (accessed September 28, 2026).
HarvardWebster's 2011, physograde, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/physograde/definitions/2045208>.
MLAWebster's. "physograde" 27 May 2011. Web. 28 September 2026. <http://smartdefine.org/physograde/definitions/2045208>