addition of one or more letters to a word
• (n.) The addition of a letter at the end of a word, without changing its sense; as, numb for num, whilst for whiles.
1. Orthopedic correction of a deformed extremity. ... 2. A splint or other apparatus applied to an extremity. ... Origin: epi-+ G. Tithemi, to place ... (05 Mar 2000) ... 
E·pith'e·sis noun [ New Latin , from Greek ... a putting on;