Land-surveying. Obs. [f. WAD v.2 + -ER1.] One who is engaged in determining a wad or line of direction.
1610. W. Folkingham, Feudigr., II. iv. 53. If out of sight place two Assistants, the one at the marke, and the other at the eminentest Medium, and then your selfe standing at the station giuen, and the first Assistant erecting some visible obiect, waft the Wadders into the Wadd.