A power tool for smoothing or shaping wood WordNet 3.0 & Open English WordNet

A planer is a type of metalworking machine tool that uses linear relative motion between the workpiece and a single-point cutting tool to cut the work piece. Wikipedia

A metalworking machine-tool having a reciprocating work table and a stationary cutting tool Wikipedia Disambiguation

metalworking machine tool Wikidata

A large machine tool in which the workpiece is traversed linearly (by means of a reciprocating bed) beneath a single-point cutting tool. (Analogous to a shaper but larger and with the workpiece moving instead of the tool.) Planers can generate various shapes, but were most especially used to generate large, accurate flat surfaces. The planer is nowadays obsolescent, having been mostly superseded by large milling machines. Wiktionary

Large machine tool. Wiktionary (translation)