adze

A cutting tool that has a curved blade set at a right angle to the handle and is used in shaping wood.

...if I wanted a board, I had no other way but to cut down a tree, set it on an edge before me, and hew it flat on either side with my axe, till I brought it to be thin as a plank, and then dub it smooth with my adze.

To shape a material using an adze.