[hem-uh-roid, hem-roid]
Usually, hemorrhoids. Pathology. an abnormally enlarged vein mainly due to a persistent increase in venous pressure, occurring inside the anal sphincter of the rectum and beneath the mucous membrane (internal hemorrhoid) or outside the anal sphincter and beneath the surface of the anal skin (external hemorrhoid)
Also called pile.

1350–1400; Middle English emoroides (plural) < Latin haemorrhoid(a) < Greek haimorroḯda (adj.) discharging blood

hemorrhoidal, adjective
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World English Dictionary
haemorrhoids or hemorrhoids (ˈhɛməˌrɔɪdz)
pl n
pathol Nontechnical name: piles swollen and twisted veins in the region of the anus and lower rectum, often painful and bleeding
[C14: from Latin haemorrhoidae (plural), from Greek, from haimorrhoos discharging blood, from haimo-haemo- + rhein to flow]
hemorrhoids or hemorrhoids
pl n
[C14: from Latin haemorrhoidae (plural), from Greek, from haimorrhoos discharging blood, from haimo-haemo- + rhein to flow]
haemor'rhoidal or hemorrhoids
hemor'rhoidal or hemorrhoids

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., emeroudis, from O.Fr. emorroides, from L. hæmorrhoidæ, from Gk. haimorrhoides, pl. of haimorrhois, from haima "blood" (see -emia) + rhoos "a stream, a flowing," from rhein "to flow" (see rheum).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hemorrhoid hem·or·rhoid (hěm'ə-roid')

  1. An itching or painful mass of dilated veins in swollen anal tissue.

  2. or hemorrhoids The pathological condition in which such painful masses occur. Also called piles.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He had tuberculosis, boils, hemorrhoids and headaches.
We know little about him, other than that he treated the great writer's hemorrhoids.
We humans are saddled with all sorts of lousy design features, hemorrhoids being the obvious example.
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