/ Dictionary / Index U ultrahigh frequency: Meaning and Definition of Find definitions for: ul'trahigh fre'quency Pronunciation: [key] — Radio. Radio. any frequency between 300 and 3000 megahertz. Abbr.: UHF, uhf Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultrahigh ultraism Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language