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-gas·sing.
to subject to tear gas.

Origin:
1945–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Tear gas is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
tear gas (tɪə) [Click for IPA pronunciation guide]
 
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
The police then used tear gas and what the protesters took to be rubber bullets
  against them.
After then trying to flee, he was attacked with tear gas.
With white onlookers cheering, the troopers rushed ahead, hitting the
  demonstrators and exploding canisters of tear gas.
After negotiations broke down, authorities forcibly retook the facility, using
  tear gas and live ammunition.
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