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Webster's 1913 Dictionary

HYDROPHYLLIUM

Hy `dro *phyl "li *um, n.; pl. L. Hydrophyllia, E. Hydrophylliums. Etym: [NL. , fr. Gr. "y `dwr water + (Zoöl.)

 

Defn: One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.