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|Noun||1.||venous sinus - a wide channel containing blood; does not have the coating of an ordinary blood vessel|
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"
coronary sinus, sinus coronarius - a short sinus receiving most of the veins of the heart; empties into the right atrium