/ Dictionary / Index R rollock: Meaning and Definition of Find definitions for: rol•lock Pronunciation: (rol'uk), [key] — n. rowlock. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rollo roll-off Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language