n. [ AS. twibill; twi- (in comp.) two + bill, bil, an ax, hoe, bill. See Twice, and Bill a cutting instrument. ] 1. A kind of mattock, or ax; esp., a tool like a pickax, but having, instead of the points, flat terminations, one of which is parallel to the handle, the other perpendicular to it. [ Prov. Eng. ] [ 1913 Webster ]
2. A tool for making mortises. [ Obs. ] [ 1913 Webster ]