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a combining form meaning “muscle,” used in the formation of compound words:
Also, especially before a vowel, my-.
Origin of myo-
combining form representing Greek mŷs mouse, muscle Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for myo-


combining form
muscle: myocardium
Word Origin
from Greek musmuscle
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 myo-

before vowels my-, word-forming element meaning "muscle," from comb. form of Greek mys "muscle," literally "mouse" (see muscle (n.)).

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

myo- or my-
Muscle: myograph.

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