Definition of prosthesis noun from the Oxford Advanced Learner's Dictionary



BrE BrE//prɒsˈθiːsɪs//
; NAmE NAmE//prɑːsˈθiːsɪs//
(pl. prostheses
BrE BrE//prɒsˈθiːsiːz//
; NAmE NAmE//prɑːsˈθiːsiːz//
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an artificial part of the body, for example a leg, an eye or a tooth Word Originmid 16th cent. (originally denoting the addition of a letter or syllable at the beginning of a word): via late Latin from Greek prosthesis, from prostithenai, from pros ‘in addition’ + tithenai ‘to place’.
See the Oxford Advanced American Dictionary entry: prosthesis