'Epithesis' definitions:

Definition of 'Epithesis'

From: GCIDE

Epithesis \E*pith"e*sis\, n. [NL., fr. Gr. ? a putting on; 'epi` upon + ? to place.] The addition of a letter at the end of a word, without changing its sense; as, numb for num, whilst for whiles. [1913 Webster]