roloway
/ˈrəʊləweɪ/ /ˈrɒləweɪ/(also rolloway)
noun
A Diana monkey of the subspecies Cercopithecus diana roloway, found in parts of tropical West Africa and distinguished from the typical Diana monkey by its longer beard. More fully roloway monkey, roloway guenon.
Origin
Late 18th century; earliest use found in Thomas Pennant (1726–1798), naturalist, traveller, and writer. From scientific Latin roloway, former specific name (in Simia roloway; F. Allamand in Buffon Hist. Naturelle (new ed., 1771) XV. 77), perhaps from a language of West Africa, although a likely donor form has not been traced, or perhaps from a mistaken use of Sinhala riḷavā.