planer

/ˈpleɪnər/
noun
  1. A tool or machine used to make wood or metal surfaces smooth and flat by removing thin layers.
    • The carpenter used a planer to smooth the rough edges of the board.
    • He adjusted the planer to take off just a millimeter of wood.
    • In the workshop, the planer hummed as it shaved off thin strips of oak.
adjective
  1. Comparative form of plane; more flat or level.
    • We need a planer piece of glass for the telescope lens.
    • This surface is planer than the old one after sanding.
    • The new road is much planer than the bumpy dirt track.