Definition of "finny" in English

adjective

1. (of a fish) Having one or more fins.

2. Resembling a fin.

3. Abounding in fishes.

   • 1730–1774, Oliver Goldsmith, Introductory to Switzerland Cheerful at morn, he wakes from short repose, Breathes the keen air, and carols as he goes; With patient angle trolls the finny deep, Or drives his venturous ploughshare to the steep;

noun

1. (UK, slang) A five-pound (£5) note; the sum of five pounds.