Definition of "ductus" [ductus]

• The number of strokes that make up a written letter, and the direction, sequence and speed in which they are written (noun)
• A subtle reduction of weight towards the middle of the stroke of the letter (noun)
• A duct, tube or canal in the body (noun)

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• "The third structure that's important that connects the umbilical vein to the fetal circulation is a site, a junction, called the ductus venosus."
• "A newborn can survive with a disconnection in the aorta as long as a blood vessel called the ductus arteriosus remains open."
• "The majority goes into a structure called the ductus arteriosus, which is the second point in communication between the pulmonary artery and the descending aorta."