/ Dictionary / Index H Hyacinthus: Meaning and Definition of Find definitions for: Hy•a•cin•thus Pronunciation: (hī"u-sin'thus), [key] — n. Class. Myth. a youth loved but accidentally killed by Apollo: from the youth's blood sprang the hyacinth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyacinthine Hyades Related Content Daily Word Quiz: voracious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language