/ Dictionary / Index H histo-: Meaning and Definition of Find definitions for: histo- Pronunciation: [key] a combining form meaning “tissue,” used in the formation of compound words: histology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. histioid histoblast Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language