Word Study
Myo-
CIDE DICTIONARY
Myo-,
A combining form of Gr. /, /, a muscle; as, myograph, myochrome. [1913 Webster]
OXFORD DICTIONARY
Myo-, comb. form (also my- before a vowel) muscle.
Etymology
Gk mus muos muscle
For further exploring for "Myo-" in Webster Dictionary Online