aphetic forms
Definition - The language-change process where new words are created by the loss of a short unaccented vowel at the beginning of another word is called aphesis. The words resulting from this process are called aphetic forms.

Example -

(1) mend from amend
(2) tend from attend
(3) cute from acute

Etymology -
The word aphetic derives from the Greek aphienai, to send forth (from Greek apo, from + hienai, to send).

Oxford English Dictionary -
Its first citation is from 1880 (Murray citing himself):
"The Editor can think of nothing better than to call the phenomenon Aphesis. .. and the resulting forms Aphetic forms. "
(J. A. H. Murray in Transactions of the Philological Society, 175)

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