#control_rod__controlrod  a steel or aluminum rod that can be moved up or down to control the rate of the nuclear reaction
  supertype:  #rod  a long thin implement made of metal or wood
  part of:  #nuclear_reactor__reactor  (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements

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