Prosthesis

n. device used to replace a missing limb or body part; placement of additional sounds at the beginning of a word or line of poetry

In medicine, a prosthesis is an artificial extension that replaces a missing body part. It is part of the field of biomechatronics, the science of fusing mechanical devices with human muscle, skeleton, and nervous systems to assist or enhance motor control lost by trauma, disease, or defect. Prostheses are typically used to replace parts lost by injury (traumatic) or missing from birth (congenital) or to supplement defective body parts. In addition to the standard artificial limb for every-day use, many amputees have special limbs and devices to aid in the participation of sports and recreational activities.
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Prosthesis /pros·the·sis/ pl. prosthe´ses [Gr.] an artificial substitute for a missing body part, such as an arm, leg, eye, or tooth; used for [more]Prosthesis - Community and Resources

Noun
1. corrective consisting of a replacement for a part of the body
(synonym) prosthetic device
(hypernym) corrective, restorative
(hyponym) glass eye

(n.)
The prefixing of one or more letters to the beginning of a word, as in beloved.
  

(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.