noun

• (Scotland, Canada, Australia) Alternative form of whiskey, an alcoholic liquor distilled from fermented grain, usually aged in oak barrels, (particularly) Scotch; a drink of this liquor.
  "That the young Mr. Churchills liked—but they did not like him coming round of an evening and drinking weak whisky-and-water while he held forth on railway debentures and corporation loans. Mr. Barrett, however, by fawning and flattery, seemed to be able to make not only Mrs. Churchill but everyone else do what he desired."

noun

• (historical) Alternative form of whiskey (“a light gig or carriage”).
  "1768, Ignatius Sancho, letter to Mr. M—, in Letters of the Late Ignatius Sancho, London: J. Nichols, 3rd edition, 1784, pp. 7-8, Look into old age, you will see avarice joined to poverty—letchery, gout, impotency, like three monkeys, or London bucks, in a one-horse whisky, driving to the Devil."