/ Dictionary / Index R rectilinear: Meaning and Definition of Find definitions for: rec•ti•lin•e•ar Pronunciation: (rek"tl-in'ē-ur), [key] — adj. forming a straight line. formed by straight lines. characterized by straight lines. moving in a straight line. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rectilinear (Thesaurus) rectify rectirostral Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language