#armrest  a support for the arm
  supertype:  rest  a support on which things can be put; "the gun was steadied on a special rest"
  part of:  car_door
  subtype:  arm.armrest  the part of an armchair or sofa that supports the elbow and forearm of a seated person
     subtype:  writing_arm  an arm of a tablet-armed chair; widened to provide a writing surface

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