Definition of prosthesis noun from the Oxford Advanced American Dictionary

 

prosthesis

 noun
noun
NAmE//prɑsˈθisəs//
 
(pl. prostheses
NAmE//prɑsˈθisiz//
 
)
(medical)
 
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an artificial part of the body, for example a leg, an eye, or a tooth
NAmE//prɑsˈθɛt̮ɪk//
 
adjective a prosthetic arm
See the Oxford Advanced Learner's Dictionary entry: prosthesis