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|n. pl.||1.||(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.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.