Painful swellings of the veins of the mucous membrane in the rectum at the anus, often accompanied by bleeding.

(常用复数)【医】痔；痔疮(通称piles)。痔疮是直肠末端黏膜下和肛管皮下静脉丛瘀血、曲张，扩大形成一个或多个球状的静脉瘤。