/ Dictionary / Index R roll cloud: Meaning and Definition of Find definitions for: roll' cloud" Pronunciation: [key] — Meteorol. Meteorol. arcus. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. roll call rolled collar 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