amputate
am·pu·tate
/ˈæmpjəˌteıt/ verb , -tates, -tat·ed, -tat·ing [ + obj ]
medical : to cut off (part of a person's body)
His arm/leg was badly injured and had to be amputated.
am·pu·ta·tion /ˌæmpjəˈteıʃən/ noun , pl -tions [ count , noncount ]