Four-footed; having four limbs fitted for sustaining the body and for progression; habitually going on all fours: opposed to aliped and biped: correlated with quadrumanous and pedimanous: chiefly said of mammals, but also of four-footed reptiles, as lizards and tortoises. Compare quadrumanous.n. A four-footed or quadruped animal: especially, a four-footed mammal, as distinguished from a biped, as man or a bird.