
1) Metalworking cutting tool
Found on
https://www.crosswordclues.com/clue/end-mill

An end mill is a type of milling cutter, a cutting tool used in industrial milling applications. It is distinguished from the drill bit in its application, geometry, and manufacture. While a drill bit can only cut in the axial direction, a milling bit can generally cut in all directions, though some cannot cut axially. End mills are used in millin...
Found on
http://en.wikipedia.org/wiki/End_mill

Usually a multi-fluted cutting tool generally used in machining operations. While some have straight flutes, most are spiralled and are used for heavy cuts at low speeds.
Found on
http://www.encyclo.co.uk/local/20829

A cutting tool that is used to machine a mould
Found on
http://www.protomold.co.uk/Glossary.xhtml

(in a milling machine) a rotating cutting tool having a cylindrical shank with teeth at the end, used for machining the faces and sides of metal pieces and other objects.
Found on
https://www.infoplease.com/dictionary/end-mill
No exact match found.