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mass hysteria

noun, Psychology.
a condition affecting a group of persons, characterized by excitement or anxiety, irrational behavior or beliefs, or inexplicable symptoms of illness.
Also called epidemic hysteria.
Origin of mass hysteria
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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mass-hysteria in Medicine

mass hysteria n.

  1. Spontaneous, en masse development of identical physical or emotional symptoms among a group of individuals, as in a classroom of schoolchildren.

  2. A socially contagious frenzy of irrational behavior in a group of people as a reaction to an event.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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