- isorhiza
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n. [Gr. isos, equal; rhiza, root](CNIDARIA)A form of nematocyst in which the tube is open and the same diameter along the tube, responding to mechanical stimuli, and is used in anchoring the animal when it walks on its tentacles; see atrichous isorhiza, holotrichous isorhiza, basitrichous isorhiza.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.