rhino

Etymology 1

Unknown.

noun

1. (slang, now rare) Money.
   When so be as a man has no money, why then, a savin and exceptin your onnur's reverence, a's but a poor dog. But when so be as a man as got the rhino, why then a may begin to hold up his head. 1792, Thomas Holcroft, Anne St. Ives, vol. III.52
   There I fell in with Betsy, and as she proved a regular out and outer, I spliced her, and a famous wedding we had of it, as long as the rhino lasted. 1835, Frederick Marryat, The Pacha of Many Tales

Etymology 2

Clipping of rhinoceros.

noun

1. (colloquial) A rhinoceros.
   ‘We were getting a grand shot of a charging rhino when the cameraman got scared and bolted. The fathead!’ 1932, Delos W. Lovelace, King Kong, published 1965, page 24
   This cutting from an East African newspaper caught our eye last month: "The up mail train from Mombasa was held up for an hour at Kibwezi by an angry rhino on Monday night." 1961 October, “Talking of Trains: B.R. exile at work?”, in Trains Illustrated, page 586