/ Dictionary / Index R registered nurse: Meaning and Definition of Find definitions for: reg'istered nurse' Pronunciation: [key] a graduate nurse who has passed a state board examination and been registered and licensed to practice nursing. Abbr.: R.N. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. registered mail registered representative Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language