músculo
/ˈmuskulo/ · B1 · noun · m
tissue
💪🐭 Latin musculus = little mouse: mus (mouse) + -culus (small)
English muscle comes from the same Latin word, so músculo is just muscle + -o. Romans said a flexing muscle moved like a small mouse under the skin. The stress falls on the first syllable: MÚS-cu-lo.