Etymology
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macaque (n.)
East Indian monkey, 1757, from French macaque, from Portuguese macaco "monkey," a Bantu word brought from Africa to Brazil (where it was applied 17c. to a type of monkey there). Introduced as a genus name 1840.
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Macaca 

name of a genus of Old World monkeys, Modern Latin, from Portuguese macaca, fem. of macaco, a name from an African language of the Congo (compare macaque).

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rhesus 

1827, "macaque, sacred monkey of India," from the Modern Latin genus name of a type of East Indian monkey (1799), given by French naturalist Jean-Baptiste Audebert (1759-1800) and said to be an arbitrary use of Latin Rhesus, the name of a legendary prince or king of Thrace, from Greek Rhēsos, which is also a river name.

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