/ Dictionary / Index D ductus arteriosis: Meaning and Definition of Find definitions for: duc•tus ar•te•ri•o•sis Pronunciation: (duk'tus är-tēr"ē-ō'sis), [key] — Anat. Anat. 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. ductule ductwork Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language