SYNAERESIS Meaning of SYNAERESIS in English n. (US syneresis) (pl. synaereses) the contraction of two vowels into a diphthong or single vowel. [ LL f. Gk sunairesis (as SYN-, hairesis f. haireo take) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012