root cutter
/ˈruːt ˌkʌtə/noun
1A collector of plants and their roots for medicinal purposes; a herbalist; = rhizotomist. Chiefly historical (as a gloss for the Greek etymon or with reference to ancient Greek medicine).
2An implement or device used for cutting roots, especially (a) a tool or machine used to chop root vegetables; (b) an attachment for a plough, etc., which cuts underground tree roots.
Origin
Early 18th century. From root + cutter.