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short for rhinoceros, 1884. As slang for "cash" (also rino) 1680s, of unknown origin. Hence cant rhinocerial "rich" [Grose, 1788].
before vowels rhin-, word-forming element meaning "nose, of the nose," from Greek rhino-, comb. form of rhis "nose," which is of uncertain origin.
rhino- or rhin-
Nose; nasal: rhinitis.