ductus arteriosis

[duhk-tuhs ahr-teer-ee-oh-sis]

duc·tus ar·te·ri·o·sis

[duhk-tuhs ahr-teer-ee-oh-sis]
noun Anatomy.
a fetal blood vessel that connects the left pulmonary artery directly to the descending aorta, normally closing after birth.

Origin:
1805–15; < Neo-Latin: literally, arterial channel
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ductus arteriosis is always a great word to know.
So is knee. Does it mean:
the joint of the leg that allows for movement between the femur and tibia and is protected by the patella
one member of the two lowest pairs of ribs, which are attached neither to the sternum nor to the cartilages of other ribs.
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