反そり台だい鉋かんな

noun

wooden plane with a convex base curved in the cutting direction

Specialized woodworking tool; the convex sole allows planing concave surfaces. The term is technical and primarily used in carpentry contexts.

• 反そり台だい鉋かんなは、内うち側がわに湾わん曲きょくした面めんを削けずるのに使つかわれる。

  A convex-base plane is used to shave inwardly curved surfaces.