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Meaning of ductus arteriosis

duc•tus ar•te•ri•o•sis

Pronunciation: (duk'tus är-tēr"ē-ō'sis), [key]
— Anat. Anat.
  1. a fetal blood vessel that connects the left pulmonary artery directly to the descending aorta, normally closing after birth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.