Sartorius \Sar*to"ri*us\, n. [NL., fr. L. sartor a patcher, tailor, fr. sarcire, sartum, to patch, mend.]

(Anat.) A muscle of the thigh, called the tailor's muscle, which arises from the hip bone and is inserted just below the knee. So named because its contraction was supposed to produce the position of the legs assumed by the tailor in sitting.

Source: Webster's Revised Unabridged Dictionary (1913)