- venous sinus, sinus - a wide channel containing blood; does not have the coating of an ordinary blood vessel
--1 is a kind of duct, epithelial duct, canal, channel
--1 has particulars:cavernous sinus, sinus cavernosus; coronary sinus, sinus coronarius; sigmoid sinus, sinus sigmoideus; straight sinus, tentorial sinus, sinus rectus; transverse sinus, sinus transversus