/ Dictionary / Index S semivowel: Meaning and Definition of Find definitions for: sem•i•vow•el Pronunciation: (sem'ē-vou"ul), [key] — n. a speech sound of vowel quality used as a consonant, as (w) in wet or (y) in yet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semivowel (Thesaurus) semivitreous semiweekly 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