/ Dictionary / Index R reducing glass: Meaning and Definition of Find definitions for: reduc'ing glass" Pronunciation: [key] a lens or mirror that produces a virtual image of an object smaller than the object itself. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. reducing agent reduct Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language