Real Dictionary

lemur
countable noun: A lemur is an animal that looks like a small monkey and has a long tail and a face similar to that of a fox.

lemur in American English
any of a family (Lemuridae) of prosimian primates with large eyes, a long tail, a pointed muzzle, and soft, woolly fur: they are mostly tree-dwelling and nocturnal, and are found only in Madagascar and the Comoro Islands
noun: any of various small, arboreal, chiefly nocturnal mammals of the family Lemuridae, of Madagascar and the Comoro Islands, esp. of the genus Lemur, usually having large eyes, a foxlike face, and woolly fur: most lemurs are endangered

lemur in British English
noun: any Madagascan prosimian primate of the family Lemuridae, such as Lemur catta (the ring-tailed lemur). They are typically arboreal, having foxy faces and long tails