/ Dictionary / Index A Arc, d': Meaning and Definition of Find definitions for: Arc d' Pronunciation: (dark), [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arc csc Arc de Triomphe Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language