synalepha

The blending into one syllable of two successive vowels of adjacent words, especially to fit a poetic meter; for example, th’ elite for the elite.

A contraction of syllables by suppressing some vowel or diphthong at the end of a word, before another vowel or diphthong.

The suppression of a vowel at the end of word when it is followed by another word beginning with a vowel.

The melding into a single syllable of two vowels from two different syllables.