'muscle' originates from Latin, specifically the word 'musculus,' where 'mus' meant 'mouse,' referring to the shape of muscles resembling mice under the skin.

'musculus' transformed into the Old French word 'muscle,' and eventually became the modern English word 'muscle' through Middle English.

Initially, it meant 'little mouse,' but over time it evolved into its current meaning of 'a band of fibrous tissue in the body.'