Hypertext Webster Gateway: "hydrophyllium"
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.
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