/ Dictionary / Index S semivitreous: Meaning and Definition of Find definitions for: sem•i•vit•re•ous Pronunciation: (sem"ē-vi'trē-us, sem"ī-), [key] — adj. partially vitreous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. semitruck semivowel Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language