/ Dictionary / Index L Leonidas: Meaning and Definition of Find definitions for: Le•on•i•das Pronunciation: (lē-on'i-dus), [key] — n. died 480 b.c., Greek hero: king of Sparta 489?–480. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: leonidas (Thesaurus) Leonid leonine Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language