Hy`dro*phyl"li*um (?), n.; pl. L. Hydrophyllia (#), E. Hydrophylliums (#). [NL., fr. Gr. "y`dwr water + a leaf.] Zool.

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

 

© Webster 1913.

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