Etymology
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rhizome (n.)

1832, in botany, "a stem of root-like appearance," from Modern Latin rhizoma, from Greek rhizōma "mass of tree roots," from rhizoun "cause to strike root, root into the ground, plant," from rhiza "root" (which is probably from PIE root *wrād- "branch, root"). Also in English in Modern Latin form rhizoma. Related: Rhizomic.

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Definitions of rhizome

rhizome (n.)
a horizontal plant stem with shoots above and roots below serving as a reproductive structure;
Synonyms: rootstock / rootstalk
From wordnet.princeton.edu