from the GNU version of the Collaborative International Dictionary of English
- n.pl. 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.
from The Century Dictionary and Cyclopedia
- An order of Mammalia named by Blumenbach in 1791, including all kinds of apes, monkeys, and lemurs; the quadrumanous mammals: so called because their hind as well as fore feet can be used as hands.
Sorry, no etymologies found.