noun Psychiatry.
an abnormal fear of being in crowds, public places, or open areas, sometimes accompanied by anxiety attacks.

1870–75; agora + -phobia

acrophobia, agoraphobia, claustrophobia. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
agoraphobia (ˌæɡərəˈfəʊbɪə)
a pathological fear of being in public places, often resulting in the sufferer becoming housebound
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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Word Origin & History

"fear of open spaces," 1873, from Ger. Agorophobie, coined 1871 by Berlin psychiatrist Carl Westphal (18331890) from Gk. agora "open space" (typically a marketplace), from ageirein "to assemble," + -phobia "fear."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

agoraphobia ag·o·ra·pho·bi·a (āg'ər-ə-fō'bē-ə)
Phobia of open or public places.

ag'o·ra·pho'bic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Agoraphobia is a fear of being in places where help might not be available.
He suffered from agoraphobia and feared leaving his home.
The whole nation is suffering from collective agoraphobia.
In fact, she does everything out of her home: she suffers from acute and
  debilitating agoraphobia.
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