hydrogen sulfide

noun
a colorless, flammable, water-soluble, cumulatively poisonous gas, H 2 S, having the odor of rotten eggs: used chiefly in the manufacture of chemicals, in metallurgy, and as a reagent in laboratory analysis.
Also called sulfureted hydrogen.


Origin:
1870–75

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American Heritage
Medical Dictionary

hydrogen sulfide n.
A colorless, flammable poisonous gas that has a characteristic rotten-egg odor, is formed in the decomposition of organic matter containing sulfur, and is used as an antiseptic, a bleach, and a reagent.

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
Science Dictionary
hydrogen sulfide  
A colorless, poisonous gas that smells like rotten eggs. It is formed naturally by decaying organic matter and is the smelly component of intestinal gas. It is also emitted by volcanoes and fumaroles. Hydrogen sulfide is used in the petroleum, rubber, and mining industries, and in making sulfur. Chemical formula: H2S.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At the bottom of the food chain are microbes that get their energy from
  chemicals in the vents, usually hydrogen sulfide.
By mixing toilet cleaner with pesticide, anyone can make a cloud of deadly
  hydrogen sulfide gas.
These secrete hydrogen sulfide, a gas which is poisonous to animal life.
The cave puts out high levels of hydrogen sulfide, a gas that can be deadly to
  humans.
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