Noun
(writing)
the number of strokes that make up a written letter, and the direction, sequence and speed in which they are written (Compare graph; see also aspect.)
a subtle reduction of weight towards the middle of the stroke of the letter
(anatomy) a duct, tube or canal in the body
Source: en.wiktionary.orgAs early as the 17th century, William Harvey had already discerned the existence of the Ductus Arteriosus and explained its relative function. Source: Internet