Syn*aer"e*sis, Syn*er"e*sis (?), n. [NL., fr. Gr. a taking or drawing together, fr. to take together; with + to take, to grasp. See Syn-, and Heresy.] Gram.
The union, or drawing together into one syllable, of two vowels that are ordinarily separated in syllabification; synecphonesis; -- the opposite of diaeresis.
© Webster 1913.