/ Dictionary / Index N nylon letdown: Meaning and Definition of Find definitions for: ny'lon let'down Pronunciation: [key] — Mil. Slang. Mil. Slang. evacuation from an aircraft by means of a parachute. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nylon NYME Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language