the GNU version of the Collaborative International Dictionary of English
n. Same as synæresis.
The Century Dictionary and Cyclopedia
n. In grammar, the contraction of two syllables or two vowels into one; especially, contraction of two vowels so as to form a diphthong, as ne'er for never, Atreides for Atreïdes.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the contraction of two vowels into a diphthong
n. the separation of liquid from a gel that is caused by contraction (as in cheese making)
Word Usage
"But synalepha may occur in combinations of vowels in which syneresis would be impossible."