/ Dictionary / Index D Descartes: Meaning and Definition of Find definitions for: Des•cartes Pronunciation: (dā-kärt' Fr. dā-kart'), [key] 1596–1650, French philosopher and mathematician. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: descartes (Thesaurus) descant Descartes' law Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language