Coprophobia

Fear of feces: An abnormal and persistent fear of feces (bowel waste). Sufferers of this fear experience anxiety even though they realize their fear is irrational. They go out of their way to avoid coming into contact with feces or sometimes even seeing feces.

Fear of feces is termed "coprophobia," a word derived from the Greek "kopros" (dung) and "phobos" (fear). Alternate names: Koprophobia, scatophobia.