rhinoceros(n = noun.animal) rhino - massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout;
is a kind of odd-toed ungulate, perissodactyl, perissodactyl mammal
is a member of family rhinocerotidae, rhinoceros family, rhinocerotidae
has particulars: indian rhinoceros, rhinoceros unicornis, rhinoceros antiquitatis, woolly rhinoceros, ceratotherium simum, diceros simus, white rhinoceros, black rhinoceros, diceros bicornis

   Any pachyderm belonging to the genera Rhinoceros, Atelodus, and several allied genera of the family Rhinocerotidæ, of which several living, and many extinct, species are known. They are large and powerful, and usually have either one or two stout conical median horns on the snout. [1913 Webster]
" The Indian, or white, and the Javan rhinoceroses (Rhinoceros Indicus and Rhinoceros Sondaicus) have incisor and canine teeth, but only one horn, and the very thick skin forms shieldlike folds. The two or three African species belong to Atelodus, and have two horns, but lack the dermal folds, and the incisor and canine teeth. The two Malay, or East Indian, two-horned species belong to Ceratohinus, in which incisor and canine teeth are present. See Borele, and Keitloa." [1913 Webster]

rhinoceros, n. (pl. same or rhinoceroses) any of various large thick-skinned plant-eating ungulates of the family Rhinocerotidae of Africa and S. Asia, with one horn or in some cases two horns on the nose and plated or folded skin.

Idiom:
rhinoceros bird = ox-pecker. rhinoceros horn a mass of keratinized fibres, reputed to have medicinal or aphrodisiac powers.

Derivative:
rhinocerotic adj.

Etymology:
ME f. L f. Gk rhinokeros (as RHINO-, keras horn)

black rhinoceros, genus rhinoceros, indian rhinoceros, rhinoceros antiquitatis, rhinoceros beetle, rhinoceros family, rhinoceros unicornis, white rhinoceros, woolly rhinoceros