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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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Definitions of rhesus from WordNet

rhesus (n.)
of southern Asia; used in medical research;
Synonyms: rhesus monkey / Macaca mulatta
From wordnet.princeton.edu