<psychology> An abnormal aversion to or morbid fear of dirt or filth. ... Origin: G. Rhypos, filth, + phobos, fear ... (05 Mar 2000) ... 
Type: Term Pronunciation: rī′pō-fō′bē-ă Synonyms: mysophobia
Rhypophobia is the fear of defecation.
rhypophobia, rypophobia, rupophobia 1. An extreme fear of filth, defecation, or of being soiled (dirtied). 2. An abnormal aversion to or morbid fear of dirt or filth. This phobia may be related to fears of contamination and germs and therefore to fears of using public toilet facilities.