| haemorrhoid | Denoting one of the tumours or varices constituting haemorrhoids. (05 Mar 2000) |
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| haemorrhoidal | 1. Of or pertaining to, or of the nature of, haemorrhoids. 2. <anatomy> Of or pertaining to the rectum; rectal; as, the hemorrhoidal arteries, veins, and nerves. Origin: Cf. F. Hemorroidal, hemorrhoidal. (01 Dec 1998) |
| haemorrhoidal nerves | See: superior rectal plexus, middle rectal plexuses, inferior rectal nerves. (05 Mar 2000) |
| haemorrhoidal plexus | A venous plexus resting upon the posterior and lateral walls of the rectum; it drains into the superior rectal vein to the portal, the middle rectal to the internal iliac and the inferior rectal to the internal pudendal. Synonym: plexus venosus rectalis, haemorrhoidal plexus. (05 Mar 2000) |
| haemorrhoidal veins | An obsolete term for rectal veins. See: inferior rectal veins, middle rectal veins, superior rectal vein. (05 Mar 2000) |
| haemorrhoidal zone | The part of the anal canal that contains the rectal venous plexus. Synonym: annulus haemorrhoidalis, zona haemorrhoidalis. (05 Mar 2000) |
| haemorrhoidectomy | <procedure, surgery> Removal of haemorrhoids. Indicated in cases of persistent anal pain or bleeding. There is a convalescent period of approximately 2 weeks associated with this procedure. A good outcome is seen in better than 90% of cases. (27 Sep 1997) |
| haemorrhoids | <anatomy, surgery> A varicose dilatation of a vein of the superior or inferior haemorrhoidal plexus, resulting from a persistent increase in venous pressure. Presents as a livid and painful swelling formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus is occasionally discharged. The singular haemorrhoid is rarely used. Synonym: piles. Origin: Gr. Haimorrhois, L. Haemorrhoidae. (01 Dec 1998) |
| haemorrhoids, external | Haemorrhoids that occur below the dentate line and are generally painless. They are sometimes called skin tags, or can be seen or felt as extra skin around the anus. External haemorrhoids can become very distressing when the blood in the external haemorrhoid clots and inflammation irritates the nearby pain-sensitive skin. This condition is called a thrombosed external haemorrhoid and is quite painful. (07 Jan 1998) |
| haemorrhoids, internal | Haemorrhoids that occur above the dentate line in the anal canal which separates two types of anal skin. The skin above the dentate line is not sensitive to pain. Internal haemorrhoids, being above the dentate line, are therefore usually painless. They can cause bleeding or they may push out of (prolapse) the anal opening when they become quite large. (07 Jan 1998) |
| external haemorrhoid | Varicose dilatation of a vein of the external haemorrhoidal plexus, usually situated distal to the anal sphincter. (05 Mar 2000) |
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| haemorrhoid | pain caused by venous swelling at or inside the anal sphincter |
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| haemorrhoid | surgical procedure for tying hemorrhoids and excising them |
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