- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
before a vowel my-
from Greek mus muscle
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