‖Hy′dro‐phyl″li‐um (?), n.; pl. L. Hydrophyllia (#), E. Hydrophylliums (#). [NL., fr. Gr. ὕδωρ water + � a leaf.] (Zoöl.) One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.