acrophobia

[ak-ruh-foh-bee-uh]
noun
a pathological fear of heights.

Origin:
1890–95; < Neo-Latin; see acro-, -phobia

acrophobic, adjective, noun

acrophobia, agoraphobia, claustrophobia.
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Collins
World English Dictionary
acrophobia (ˌækrəˈfəʊbɪə)
 
n
abnormal fear or dread of being at a great height
 
[C19: from acro- + -phobia]
 
acro'phobic
 
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

acrophobia
"morbid fear of heights," 1892, medical L., from Gk. akros "at the end, the top" (see acrid) + -phobia (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acrophobia ac·ro·pho·bi·a (āk'rə-fō'bē-ə)
n.
An abnormal fear of heights.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
acrophobia [(ak-ruh-foh-bee-uh)]

An abnormal fear of heights.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
It isn't acrophobia or a terror of falling that spooks me so much as the idea of being confined without my express consent.
Acrophobia causes the driver to go slowly and insist on running the air conditioner with the windows up.
To say this has put a strain on his golf game would be akin to saying that a pilot could be hampered by acrophobia.
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