Medical Definition of hemorrhoid
: an abnormal mass of dilated and engorged blood vessels in swollen tissue that occurs internally in the anal canal or externally around the anus, that may be marked by bleeding, pain, or itching, and that when occurring internally often protrude through the external anal sphincter and when occurring externally may lead to thrombosis—usually used in plural; called also piles
Seen and Heard
What made you want to look up hemorrhoid? Please tell us where you read or heard it (including the quote, if possible).