EPITHESIS
Etymology
Noun
epithesis (countable and uncountable, plural epitheses)
(linguistics) The addition of a letter or sound at the end of a word, without changing its meaning, as in "numb" for "num" or "whilst" for "whiles".
(medicine) The surgical correction of deformity or of crooked limbs.
(medicine) A splint or other appliance to be worn.
Source: Wiktionary
E*pith"e*sis, n. Etym: [NL., fr. Gr.
Definition: The addition of a letter at the end of a word, without changing
its sense; as, numb for num, whilst for whiles.
Source: Webster’s Unabridged Dictionary 1913 Edition