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|Noun||1.||ductulus - a very small duct|
duct, epithelial duct, canal, channel - a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"
sweat duct - a small duct that conveys sweat from a sudoriferous gland to the surface of the skin
biliary ductule - excretory ducts of the liver; empty into the hepatic ducts