/ Dictionary / Index S synaeresis: Meaning and Definition of Find definitions for: syn•aer•e•sis Pronunciation: (si-ner'u-sis), [key] — n. Phonet. the contraction of two syllables or two vowels into one, esp. the contraction of two vowels so as to form a diphthong. synizesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: synaeresis (Thesaurus) syn- synaesthesia Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language