Hydrorhiza

Hy`dro`rhi´za

(Zool.) The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under Hydroidea.

[‚hī·drō′rī·zə] (invertebrate zoology) Rootlike structure of a hydroid colony.

the root-like base of a colonial COELENTERATE which fixes it to the substrate.

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