a combining form meaning “muscle,” used in the formation of compound words: myology.

Also especially before a vowel, my-.

Origin of myo-

combining form representing Greek mŷs mouse, muscle Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for myo-


before a vowel my-

combining form


Word Origin for myo-

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.)).

Online Etymology Dictionary, © 2010 Douglas Harper

myo- in Medicine



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