rhinoceros rhinoceros /raɪˈnɒs.ər.əs/ aep /-ˈnɑː.sɚ-/ noun [C] (PLURALrhinoceros or rhinoceroses) (INFORMALrhino) ► F0 a very large thick-skinned animal from Africa or Asia, which has one or two horns on its nose: » a population of black/white rhinocerosThesaurus+: ↑Wild mammals , ↑Humans, apes and monkeys , ↑Felines (cats) , ↑Canines (dogs) , ↑Deer and antelope , ↑Rodents and similar animals , ↑Marine mammals