aphetism
noun/ˈæ.fəˌtɪ.zəm/
Etymology From aphesis + -ism.
1
The aphetized form of a word, i.e. a word which has dropped its initial vowel or syllable, such as squire or vanguard.
2
Aphesis.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.