tool-rest

from The Century Dictionary.

• noun A device on the front of a lathe, used either as a support for a handtool or for holding a cutting-tool in position. It has sometimes various adjustments for moving the tool. See slide-rest, and cut under lathe.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Mach.) the part that supports a tool-post or a tool.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun that part of a machine, such as a lathe, that supports the cutting tool