#bronchus__bronchial_tube__bronchialtube  either of the two main branches of the trachea
  supertype:  #cartilaginous_tube__cartilaginoustube  a tube with cartilaginous walls
  subtype:  #bronchiole  any of the smallest bronchial tubes; ending in alveoli
  part of:  #lower_respiratory_tract__lowerrespiratorytract  the bronchi and lungs

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