prosthesis
n.an artificial body part that replaces a missing one, like a leg or an arm. It can also mean a fake tooth or a device that helps you see or hear better.
n.an artificial replacement for a missing body part, such as a limb, tooth, or eye. In a linguistic context, it refers to the addition of a sound or syllable to the beginning of a word to make it easier to pronounce.
“The soldier who buried his own amputated arm and invented a custom prosthesis spent decades fiercely fighting for the pension and independence he believed he had earned.”
Via Latin, from Ancient Greek πρόσθεσις (prósthesis, “addition”), from προστίθημι (prostíthēmi, “I add”), from πρός (prós, “towards”) + τίθημι (títhēmi, “I place”), from Proto-Indo-European próti, préti + *dʰédʰeh₁ti (“to be putting, to be placing”). By surface analysis, prosth- + -esis.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.