/ Dictionary / Index O Old Nick: Meaning and Definition of Find definitions for: Old' Nick' Pronunciation: [key] — Informal Informal the devil; Satan. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. old moon Old Norse Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language