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hydrophyllium |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Hydrophyllium \Hy`dro*phyl"li*um\, n.; pl L. {Hydrophyllia}, E. {Hydrophylliums}. [NL., fr Gr "y`dwr water + ? a leaf.] (Zo["o]l.) One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.