/ Dictionary / Index A Arthur: Meaning and Definition of Find definitions for: Ar•thur Pronunciation: (är'thur), [key] — n. 1830–86, 21st president of the U.S. 1881–85. legendary king in ancient Britain: leader of the Knights of the Round Table. a male given name. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arthur (Thesaurus) arthrospore Arthurian Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language