/ Dictionary / Index V vitreum: Meaning and Definition of Find definitions for: vit•re•um Pronunciation: (vi'trē-um), [key] — adj. (in prescriptions) glass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vitrescible vitri- Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language