/ prɒsˈθiːsɪs; NAmE prɑːs-/ noun
( pl. pros·theses / -ˈθiːsiːz; NAmE /) ( medical ) an artificial part of the body, for example a leg, an eye or a tooth
► pros·thet·ic / prɒsˈθetɪk; NAmE prɑːs-/ adjective :
a prosthetic arm
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WORD ORIGIN
mid 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.