tear gas

[teer]
noun
a gas that makes the eyes smart and water, thus producing a temporary blindness, used in modern warfare, to quell riots, etc.

Origin:
1915–20

Dictionary.com Unabridged

tear-gas

[teer-gas]
verb (used with object), tear-gassed, tear-gassing.
to subject to tear gas.

Origin:
1945–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
tear gas (tɪə)
 
n
Also called: lacrimator any one of a number of gases or vapours that make the eyes smart and water, causing temporary blindness; usually dispersed from grenades and used in warfare and to control riots

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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American Heritage
Medical Dictionary

tear gas (tēr)
n.
A gas that causes irritation of the eyes and profuse tearing.

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
Other reports stated that the police used rubber bullets and tear gas while
  arresting demonstrators.
Sometimes the fans go overboard to the point where the police guarding the
  field fire tear gas the crowd to calm them down.
The police were equipped with flak jackets, tear gas launchers shotguns, and
  telescopic rifles.
The rest faded away into the night, many of them weeping, and not because of
  the tear gas.
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