| NOUN | body | ductus arteriosus | a blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta |
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| Meaning | A blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta; normally closes at birth. | |
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| Part of | fetus, foetus | An unborn or unhatched vertebrate in the later stages / stages of development showing the main recognizable features of the mature animal |
| Narrower | patent ductus arteriosus | A ductus arteriosus that failed to close at birth |
| Broader | blood vessel | A vessel in which blood circulates |
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