/ Dictionary / Index A Arcesilaus: Meaning and Definition of Find definitions for: Ar•ces•i•la•us Pronunciation: (är-ses"u-lā'us), [key] — n. 316–241 b.c., Greek philosopher. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Arcella* Arcesius Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language