An enema is a medical procedure in which a liquid is introduced into the rectum through the anus. This is typically done to cleanse the colon or to administer medication. Enemas can be used for various reasons, such as relieving constipation, preparing for medical examinations, or delivering drugs.
The word "enema" comes from the Greek word "ainema," which means "to inject." It has been used in English since the 15th century.