hemorrhoid /hem·or·rhoid/ (hem´ah-roid) prolapse of an anal cushion, resulting in bleeding and painful swelling in the anal canal. 
internal 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.
internal hemorrhoid,
a fold of mucous membrane at the anorectal junction, caused by edema or dilation of the interior rectal vein.
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