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muscle

/ˈmʌsəl/

Contractile tissue producing movement and physical force

From Latin mūs / mus- (mouse).

noun
noun
noun
verb
mūs / mus-
Latin
Verified
mūs (genitive mūris)
“mouse”; the animal-name behind the later metaphor

from Latin musculus "a muscle," literally "a little mouse," diminutive of mus "mouse" (see mouse (n.)). So called...

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Latin
Verified
musculus
“little mouse,” diminutive of mūs; also “muscle”

from Latin musculus "a muscle," literally "a little mouse," diminutive of mus "mouse" (see mouse (n.)). So called...

+1 more source
Middle English
Verified
muscle, muscule, muskylle
A bodily muscle, borrowed through French and Latin

from Middle English muscle, muscule, muskylle, and in part

Modern English
Verified
muscle
Contractile tissue; later also bodily strength or coercive force

from Middle English muscle, muscule, muskylle, and in part

Modern English
muscle

A biceps was once imagined as a tiny animal hiding under the skin. Latin speakers called a mouse mūs, then made it smaller with the diminutive suffix and produced musculus—literally “little mouse,” a name inspired by the way certain muscles bulge and move. The same visual joke appeared in ancient Greek, where mys meant both “mouse” and “muscle,” leaving medical English the combining form myo-. This family also scampered into musk: Persian mushk and Sanskrit muska referred to a scent gland thought to resemble a mouse—or, more specifically, a testicle. By about 1850, muscle had flexed beyond anatomy to mean strength, and by 1930 American English had made it a threat: “use some muscle.”

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