boring mill

noun

1. Metalworking.,  a machine for boring large holes in heavy work, having a table on which the work rotates while the hole is bored vertically.

boring mill

noun

1. Also called (informal): roundabout. engineering a large vertical lathe having a rotating table on which work is secured. Tools are held on a fixed post and the work is rotated around it

Word History and Origins

Origin of boring mill¹

First recorded in 1825–35