defecator

noun

1. One who defecates.

   “Number two in the news: In January police in New Waterford, Nova Scotia, were investigating a suspected serial defecator who had soiled three locations around town during the holiday season, including the floor of a recreation center.”

2. (archaic)That which cleanses or purifies; especially, an apparatus for removing impurities from juices and syrups.

   “After the preliminary filtering or settling of the juice, it is taken into the defecator, and there receives the treatment with lime.”