hemorrhoid /hem·or·rhoid/ (hem´ah-roid) prolapse of an anal cushion, resulting in bleeding and painful swelling in the anal canal. 
strangulated hemorrhoid
)
Hemorrhoids: (A), internal; (B), external; (C), mixed; (D), thrombosed.
external hemorrhoid one in a vein of the inferior rectal plexus, below the pectinate line and covered with modified anal skin.
internal hemorrhoid one in a vein of the superior rectal plexus, originating above the pectinate line and covered by mucous membrane.
prolapsed hemorrhoid an internal hemorrhoid that has descended below the pectinate line and protruded outside the anal sphincter.
strangulated hemorrhoid a prolapsed hemorrhoid whose blood supply has become occluded by constriction of the anal sphincter.
thrombosed hemorrhoid one containing clotted blood.
strangulated hemorrhoid
Etymology: L, strangulare, to choke; Gk, haimorrhoise, vein that discharges blood
a prolapsed hemorrhoid that has become trapped by the anal sphincter, causing the blood supply to become occluded by the sphincter's constricting action.
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