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rhino (n.)

short for rhinoceros, 1884. As slang for "cash" (also rino) 1680s, but the signification is now unknown. Hence cant rhinocerial "rich."

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Definitions of rhino from WordNet

rhino (n.)
massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout;
Synonyms: rhinoceros
From wordnet.princeton.edu