a combining form representing muscle in compound words: musculoskeletal.

Origin of musculo-

< Latin mūscul(us) muscle + -o- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for musculo-

word-forming element meaning "involving or pertaining to muscles," from comb. form of Latin musculus "muscle" (see muscle (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper