D defs.my
Entry 2 senses Webster, 1913

Prosthesis

/prôsˌ-thĕs'-ĭs/ · Pros·the·sis · IPA /pɹɒsˈθiːsɪs/
01 n. The addition to the human body of some artificial part, to replace one that is wanting, as a log or an eye; -- called also prothesis.
  1. 1.
    The addition to the human body of some artificial part, to replace one that is wanting, as a log or an eye; -- called also prothesis.(Surg.) Also: prothesis
  2. 2.
    The prefixing of one or more letters to the beginning of a word, as in beloved.(Gram.)