#duct__canal__channel  a bodily passage or tube conveying a secretion or other substance
  supertype:  passage.anatomical_structure__passageway  a path or channel or duct through or along which something may pass; "the nasal passages"
  subtype:  pore.duct  spinal_canal  ductule  canaliculus  canal_of_Schlemm  venous_sinus  lacrimal_duct  nasolacrimal_duct  Haversian_canal  hepatic_duct  inguinal_canal  common_bile_duct  pancreatic_duct  lymph_vessel  salivary_duct  cerebral_aqueduct  ureter  urethra  cervical_canal  umbilical_cord  vagina  epididymis  vas_deferens  seminal_duct  ejaculatory_duct  alimentary_canal  lactiferous_duct
  part:  ampulla.body_part  the dilated portion of a canal or duct especially of the semicircular canals of the ear

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