/ Dictionary / Index U ultraviolet filter: Meaning and Definition of Find definitions for: ultravi'olet fil"ter Pronunciation: [key] — Photog. Photog. a filter used on a lens to absorb ultraviolet radiation that may impart an undesirable blue cast to a photograph. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultraviolet ultra vires Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language