‖Quad‐ru″ma‐na (?), n. pl. [NL. See Quadrumane.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.