‖Hy′dro‐rhi″za (?), n.; pl. L. Hydrorhizæ (#), E. Hydrorhizas (#). [NL., fr. E. hydra + Gr. � a root.] (Zoöl.) The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under Hydroidea.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.