deltoid: a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm
muscle: one of the contractile organs of the body
pop art: a school of art that emerged in the United Kingdom in the 1950s and became prevalent in the United States and the United Kingdom in the 1960s; it imitated the techniques of commercial art (as the soup cans of Andy Warhol) and the styles of popular culture and the mass media