/ Dictionary / Index H hydrogeology: Meaning and Definition of Find definitions for: hy•dro•ge•ol•o•gy Pronunciation: (hī"drō-jē-ol'u-jē), [key] — n. the science dealing with the occurrence and distribution of underground water. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydrogen sulfide hydrograph Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language