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myo-

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  1. a combining form meaning “muscle,” used in the formation of compound words: myology.
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Also especially before a vowel, my-.

Origin of myo-

combining form representing Greek mŷs mouse, muscle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for myo-

myo-

before a vowel my-

combining form
  1. musclemyocardium
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Word Origin

from Greek mus muscle
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

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.)).

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

myo-

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