/ Dictionary / Index A Alcyoneus: Meaning and Definition of Find definitions for: Al•cy•o•neus Pronunciation: (al-sī'u-nys", -nus), [key] — n. Class. Myth. a giant who threw a stone at Hercules and was killed when Hercules hit the stone back with his club. a giant who, invulnerable in his own country, was dragged by Hercules to another country and there killed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alcyone Ald. Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language