General Science

  • noun a wheel with teeth round it which fit into holes in a continuous strip of something

Cars & Driving

  • noun a wheel with teeth which engage in a drive chain, e.g. a timing chain


  • noun a wheel with teeth round it that fit into holes in continuous stationery or punched tape


  • A wedge-shaped piece of wood attached to the upper side of a rafter at the eave to form a break in the roofline. See also cocking piece.

Information & Library Science

  • noun a tooth on the edge of a wheel to pick up what passes over it