Faecalith is a medical term used to describe a hardened mass of fecal matter that becomes stuck in the colon. Some of the synonyms for faecalith include fecal stone, coprolith, fecal calculus, and trichobezoar. These terms are often used interchangeably in medical literature and can refer to similar conditions, depending on the location of the blockage. Other related terms include fecaloma, which can be used to describe larger fecal impactions, and rectal foreign bodies, which can result from the insertion of foreign objects into the rectum. Regardless of the specific terminology used, all of these conditions require prompt medical attention to prevent complications such as perforation or infection.