pros ‧ the ‧ sis /prɒsˈθiːsəs, prɒsˈθiːsɪs $ prɑːs-/ BrE AmE noun ( plural prostheses /-siːz/) [countable]
[ Date: 1500-1600 ; Language: Modern Latin ; Origin: Greek , 'addition' , from prostithenai 'to add to' ]
medical an artificial leg, tooth, or other part of the body which takes the place of a missing part
—prosthetic /-ˈθetɪk/ adjective