(prŏs′thē-sĭs )
[Pronunciation]
pl. [Gr. prosthesis, an addition]

1. Replacement of a missing part by an artificial substitute, such as an artificial extremity.
2. An artificial organ or part, including arms, hands, joints, heart valves, teeth, and others.

See: Boston arm
3. A device to augment performance of a natural function, such as a hearing aid.

Subentries:
dental prosthesis
expansion prosthesis
externally powered prosthesis
hair prosthesis
maxillofacial prosthesis
myoelectric prosthesis
neural prosthesis
penile prosthesis
porcine valvular prosthesis
voice prosthesis