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ductus arteriosus

[ är-tîr′ē-ōsəs ]
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n.

A fetal vessel that connects the left pulmonary artery with the descending aorta and that normally closes at birth, becoming the arterial ligament.arterial canal arterial duct Botallo's duct

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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