acrophobe
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ac·ro·pho·bi·a
(ăk′rə-fō′bē-ə)n.
An abnormal fear of high places.
ac′ro·phobe′ n.
ac′ro·pho′bic (-fō′bĭk) adj. & n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
acrophobe
(ˈækrəʊˌfəʊb)n
a person who is abnormally afraid of heights
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014