bat·o·pho·bi·a 
(băt′ə-fōbē-ə)
(băt′ə-fōbē-ə)n.
An abnormal fear of being near an object of great height, such as a skyscraper or mountain.
[Greek batos, passable (from bainein, to go; see gwā- in the Appendix of Indo-European roots) + -PHOBIA.]
bato·phobe′ n.
bat′o·phobic adj.