#chair  a seat for one person, with a support for the back
  supertype:  seat.article_of_furniture  furniture that is designed for sitting on; "there were not enough seats for all the guests"
  subtype:  armchair  barber_chair  chaise_longue  Eames_chair  fighting_chair  folding_chair  highchair  ladder-back_chair  lawn_chair  rocking_chair  straight_chair  swivel_chair  tablet-armed_chair  throne.chair  wheelchair
  part:  backrest__back  a support that you can lean against while sitting; "the back of the dental chair was adjustable"
  part:  leg.support  one of the supports for a piece of furniture

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