#dead_axle  an axle that carries a wheel but without power to drive it
  supertype:  axle  a shaft on which a wheel rotates
  subtype:  axletree  a dead axle on a carriage or wagon that has terminal spindles on which the wheel revolve
     subtype:  axle_bar  an iron bar that serves as an axletree

No statement uses or specializes dead_axle; click here to add one.