the.com/quadriceps

means The large muscle group at the front of the thigh, made of four parts, that straightens the knee and powers things like walking, kicking, and standing up from a chair.

from From Latin quadri- 'four' plus ceps, a combining form of caput 'head' — so literally 'four-headed,' describing the four distinct muscle 'heads' (rectus femoris and the three vasti) that merge into one tendon. The same -ceps root shows up in biceps ('two-headed') and triceps ('three-headed').