noun, plural pros·the·ses [pros-thee-seez for 1; pros-thuh-seez for 2 ]. a device, either external or implanted, that substitutes for or supplements a missing or defective part of the body.

What does a prosthetist do?

Orthotists and prosthetists design and fabricate medical supportive devices and measure and fit patients for them. These devices include artificial limbs (arms, hands, legs, and feet), braces, and other medical or surgical devices.

How do you spell prosthesis plural?

The plural form of prosthesis is prostheses.