/ Dictionary / Index H hydrobiology: Meaning and Definition of Find definitions for: hy•dro•bi•ol•o•gy Pronunciation: (hī"drō-bī-ol'u-jē), [key] — n. the study of aquatic organisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydroairplane hydrobomb Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language