Sentence:  "The category of thread cutting tools inlcudes both the single-point and multiple-point [<WSD>chaser</WSD> type] lathe cutters." 
Meaning of the word marked with <WSD> tags:  A tool used for cleaning out screw threads, either as an integral part of a tap or die to remove waste material produced by the cutting tool, or as a separate tool to repair damaged threads. (from 19th c.)