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Webster 1913 Edition

Adj.

[Gr. [GREEK] letting go, fr. [GREEK] to let go.]

Shortened by dropping a letter or a syllable from the beginning of a word;

as, an

aphetic

word or form

–

A-phet′ic-al-ly

adv.

New Eng. Dict.

aphetic ‎(comparative more aphetic, superlative most aphetic)

(linguistics) Of, relating to, or formed by aphesis.
"'Pon" is an aphetic form of "upon".
(astrology) Of or relating to the apheta; life-giving.