/ Dictionary / Index H hypergolic: Meaning and Definition of Find definitions for: hy•per•gol•ic Pronunciation: (hī"pur-gô'lik, -gol'ik), [key] — adj. (esp. of rocket-fuel propellant constituents) igniting spontaneously upon contact with a complementary substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hypergol hyperhidrosis Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language