lyssiophobia, lyssophobia, lissophobia 1. An intense terror of becoming mad, insane, or of having a nervous breakdown. 2. An irrational fear of rabies or a fear of catching rabies. More details about the lyssiophobias 1. An intense terror of becoming mad, insane, or of having a nervous breakdown. When people fear that they are `going c... Found on http://www.wordinfo.info/words/index/info/view_unit/1231/