/ Dictionary / Index R royal fern: Meaning and Definition of Find definitions for: roy'al fern' Pronunciation: [key] a coarse fern, Osmunda regalis, having tall, upright fronds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. royal family royal fizz Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language