/ Dictionary / Index S semiopaque: Meaning and Definition of Find definitions for: sem•i•o•paque Pronunciation: (sem"ē-ō-pāk', sem"ī-), [key] — adj. partly or nearly opaque. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semiopaque (Thesaurus) semiology semiotic Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language