a combining form meaning “root,” used in the formation of compound words: rhizophagous.
Also, especially before a vowel, rhiz-.
Compare -rhiza, -rrhiza.

< Greek, combining form of rhíza root1

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World English Dictionary
rhizo- or (before a vowel) rhiz-
combining form
root: rhizomorphous
[from Greek rhiza]
rhiz- or (before a vowel) rhiz-
combining form
[from Greek rhiza]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

rhizo- or rhiz-
root: rhizoid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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