Crossword Genius

Thick horizontal underground stem of plants such as mint and iris (7)

Ross

I believe the answer is:

rhizome

(Other definitions for rhizome that I've seen before include "Subterranean plant stem" , "part of plant" , "Underground rootstock of a plan" , "Underground plant stem producing roots and shoots - zero him (anag)" , "Root" .)

I've seen this clue in The Independent.
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