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a combining form meaning “flow,” “current,” “stream,” used in the formation of compound words:
Compare -rrhea.
Origin of rheo-
combining form representing Greek rhéos stream, something flowing Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for rheo-


combining form
indicating stream, flow, or current: rheometer, rheoscope
Word Origin
from Greek rheos stream, anything flowing, from rhein to flow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rheo-

word-forming element meaning "current of a stream," from Greek rheos "a flowing, stream, current," from PIE root *sreu-; see rheum.

Online Etymology Dictionary, © 2010 Douglas Harper
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rheo- in Medicine

rheo- pref.
Current; flow: rheotaxis.

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