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Noun: haemorrhoidal vein
Usage: Brit, Cdn (US: hemorrhoidal vein)
  1. Any of several veins draining the walls of the anal canal and rectum
    "Hemorrhoids are caused by swollen haemorrhoidal veins";
    - hemorrhoidal vein [N. Amer], rectal vein, vena rectalis

Derived forms: haemorrhoidal veins

Type of: vein, vena, venous blood vessel