/ Dictionary / Index R rectangle: Meaning and Definition of Find definitions for: rec•tan•gle Pronunciation: (rek'tang"gul), [key] — n. a parallelogram having four right angles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rectangle (Thesaurus) rectal rectangular 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