Definitions

1. noun

A roller or a cylindrical tool used to shape or smooth a surface, especially in woodworking or metalworking.

“The carpenter used a ruller to smooth out the edges of the wooden board.”

2. noun

A device consisting of a rotating cylinder with a series of rollers or brushes, used to apply paint, ink, or other substances to a surface.

“The printing press used a ruller to apply the ink evenly to the paper.”