Source : Webster's Revised Unabridged Dictionary (1913)

Prosthetic \Pros*thet"ic\, a. [Cf. Gr. ? disposed to add, ? put
   on.]
   Of or pertaining to prosthesis; prefixed, as a letter or
   letters to a word.

Source : WordNet®

prosthetic
     adj 1: of or relating to prosthetics
     2: relating to or serving as a prosthesis