noun. In anatomy, any duct, tube, pipe, canal, or other conduit.

noun. 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

"The third structure that's important that connects the umbilical vein to the fetal circulation is a site, a junction, called the ductus venosus."