One of the mysteries of the English language finally explained.
Treated as plural. A former order of mammals in which all four feet resemble hands in having an opposable digit, comprising all primates other than humans; (also in form quadrumana) primates of this order.
Early 19th century; earliest use found in William Lawrence (1783–1867), surgeon. From scientific Latin Quadrumana, neuter plural (short for Quadrumana animalia) of post-classical Latin quadrumanus.
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