rhizome

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rhi·zome

(rī'zōm),
The creeping underground stem of some plants (for example, iris, calamus, and sanguinaria).
[G. rhizōma, mass of roots, fr. rhiza, root, + -oma, mass]
Farlex Partner Medical Dictionary © Farlex 2012

rhizome

a horizontal underground stem (with leaves and buds) that serves as a storage organ and a means of VEGETATIVE PROPAGATION. Rhizomes are found in flowering plants such as Iris.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005