/ Dictionary / Index R ruled surface: Meaning and Definition of Find definitions for: ruled' sur'face Pronunciation: [key] — Geom. Geom. a surface that can be generated by a straight line, as a cylinder or cone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rule rule joint 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