fear of cliffs and precipices
<psychology> Morbid fear of precipices or steep places. ... Origin: G. Kremnos, precipice, + phobos, fear ... (05 Mar 2000) ... 
Type: Term Pronunciation: krem′nō-fō′bē-ă Definitions: 1. Morbid fear of precipices or steep places.
Cremnophobia is the fear of precipices or steep places.
cremnophobia An abnormal, or morbid, fear of steep cliffs (precipices). This phobia is probably related to fears of heights and falling. Some people feel as if they have suddenly found themselves on the edge of a precipice in a roaring wind.