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|Noun||1.||sigmoid vein - tributaries of the inferior mesenteric vein; drains the sigmoid colon|
vein, vena, venous blood vessel - a blood vessel that carries blood from the capillaries toward the heart; "all veins except the pulmonary vein carry unaerated blood"
colon - the part of the large intestine between the cecum and the rectum; it extracts moisture from food residues before they are excreted