‖n. pl. [ NL. See Quadrumane. ] (Zool.) A division of the Primates comprising the apes and monkeys; -- so called because the hind foot is usually prehensile, and the great toe opposable somewhat like a thumb. Formerly the Quadrumana were considered an order distinct from the Bimana, which last included man alone. [ 1913 Webster ]

n. [ L. quattuor four + manus a hand: cf. F. quadrumane. ] (Zool.) One of the Quadrumana. [ 1913 Webster ]

a. (Zool.) Having four hands; of or pertaining to the Quadrumana. [ 1913 Webster ]

n. (Zool.) An animal having four feet, as most mammals and reptiles; -- often restricted to the mammals. [ 1913 Webster ]

a. [ L. quadrupes, -pedis; quattuor four + pes, pedis, a foot: cf. F. quadrupède. See Quadrate, and Foot. ] Having four feet. [ 1913 Webster ]

a. (Zool.) Having four feet; of or pertaining to a quadruped. [ 1913 Webster ]

n. [ L. quadru- in comp. + E. plane. ] An airplane with four superposed main supporting surfaces. Contrasted with triplane biplane and monoplane. They are now used only for hobbyist or historical activities. [ Webster 1913 Suppl. +PJC ]

v. i. To be multiplied by four; to increase fourfold; to become four times as much. [ 1913 Webster ]

a. [ L. quadruplus, from quattuor four: cf. F. quadruple. See Quadrate, and cf. Double. ] Fourfold; as, to make quadruple restitution; a quadruple alliance. [ 1913 Webster ]

Quadruple time (Mus.), that in which each measure is divided into four equal parts. [ 1913 Webster ]

n. [ Cf. F. quadruple, L. quadruplum. ] four times the sum or number; a fourfold amount; as, to receive to quadruple of the amount in damages. [ 1913 Webster ]