From Longman Dictionary of Contemporary Englishquadricepsquad‧ri‧ceps /ˈkwɒdrəseps $ ˈkwɑː-/ noun (plural quadriceps) [countable] the large muscle at the front of your thigh → bicep
Examples from the Corpus
quadriceps• I feel the rush of panic, my quadriceps flexing for flight.• Their leading scorer, Mahmoud Abdul-Rauf, suffered a bruised right quadriceps against Seattle on Wednesday and missed the game.• Front squats also place more emphasis on the quadriceps.• Everyone can see this muscle on the thigh, the quadriceps.Origin quadriceps (1800-1900) Modern Latin quadr- + -ceps (as in biceps) 