Biped

Biped, a term popularly applied to man, and to such of the lower animals as use only the pelvic limbs for progression on the ground. The term is sometimes used of any of the Chordata (q.v.), in which only two limbs are present (as in the Cetacea and Sirenia, and some lizards and fish), whether these limbs are pectoral or pelvic, i.e. corresponding to the human arm or leg.