/ Dictionary / Index R roofline: Meaning and Definition of Find definitions for: roof•line Pronunciation: (rf'līn", roof'-), [key] — n. the outline of a rooftop. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. roofless roof prism Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language