/ Dictionary / Index R reef knot: Meaning and Definition of Find definitions for: reef' knot" Pronunciation: [key] — Naut. Naut. a square knot used in reefing sails. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. reeffish reef whitetip shark Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language