nounWord forms:  plural -ses (-ˌsiːz)1.  surgerya. the replacement of a missing bodily part with an artificial substitute
 b. an artificial part such as a limb, eye, or tooth
  2.  linguistics  another word for prothesis 
 Word origin
C16: via Late Latin from Greek: an addition, from 
prostithenai to add, from 
pros- towards + 
tithenai to place