/ Dictionary / Index H highlight halftone: Meaning and Definition of Find definitions for: high'light half'tone Pronunciation: [key] dropout (def. 7). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. highlighter highline Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language