aph·e·sis /ˈæfəsəs/
字首音省略
Aph·e·sis n. The loss of a short unaccented vowel at the beginning of a word; -- the result of a phonetic process; as, squire for esquire.
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aphesis
n : the gradual disappearance of an initial (usually unstressed)
vowel or syllable as in `squire' for `esquire'