/ Dictionary / Index G gremlin: Meaning and Definition of Find definitions for: grem•lin Pronunciation: (grem'lin), [key] — n. a mischievous invisible being, said by airplane pilots in World War II to cause engine trouble and mechanical difficulties. any cause of trouble, difficulties, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gremlin (Thesaurus) gremial gremmie Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language