#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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