/ Dictionary / Index H hercynite: Meaning and Definition of Find definitions for: her•cy•nite Pronunciation: (hûr'su-nīt"), [key] — n. a black oxide mineral, FeAlO, of the spinel group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hercules' Pillars herd Related Content Daily Word Quiz: intrepid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language