/ Dictionary / Index E Eurystheus: Meaning and Definition of Find definitions for: Eu•rys•the•us Pronunciation: (yoo-ris'thē-us, -thys, yu-), [key] — n. Class. Myth. a king of Mycenae and cousin of Hercules, upon whom he imposed 12 labors. Cf. labors of Hercules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. eurypterid eurythmic Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language