#ductus_arteriosus  a blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta; normally closes at birth
  supertype:  #blood_vessel__bloodvessel  a vessel in which blood circulates
  subtype:  #patent_ductus_arteriosus  a ductus arteriosus that failed to close at birth; may require surgical correction
  part of:  #fetus__fetu__foetus  an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal

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