/ruy nos"euhr euhs/ , n. , pl. rhinoceroses , ( esp. collectively ) rhinoceros .
1. any of several large, thick-skinned, perissodactyl mammals of the family Rhinocerotidae, of Africa and India, having one or two upright horns on the snout: all rhinoceroses are endangered.
2. Douay Bible. unicorn (def. 4).
[ 1300-50; ME rinoceros rhinoceros rhinókeros, equiv. to rhino- RHINO- + -keros -horned, adj. deriv. of kéras HORN (of an animal) ]