#backrest__back  a support that you can lean against while sitting; "the back of the dental chair was adjustable"
  supertype:  #support.device  any device that bears the weight of another thing; "there was no place to attach supports for a shelf"
  subtype:  #cantle  #ladder-back
  part of:  #car_seat__carseat  a seat in a passenger car
     part of:  #passenger_car__passengercar__coach__carriage  a railcar where passengers ride
  part of:  #chair  a seat for one person, with a support for the back

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