"Turn-mill" can be an ambiguous term. Turning centers with rotary-tool capability are sometimes called turn-mill machines. But at the same time, there is a specific metalworking operation performed on these machines that rightly deserves to be called "turn-milling…
Turn/Mill Machines are capable of both rotating-workpiece operations (turning) and rotating-tool operations such milling and cross-drilling. The machine is typically recognizable as a horizontal or vertical lathe, with spindles for milling and drilling simply available at some or all of the tool positions.