a combining form meaning “flow,” “current,” “stream,” used in the formation of compound words: rheoscope.
Compare -rrhea.

combining form representing Greek rhéos stream, something flowing

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World English Dictionary
combining form
indicating stream, flow, or current: rheometer; rheoscope
[from Greek rheos stream, anything flowing, from rhein to flow]

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

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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