hydrogen peroxide

noun
a colorless, unstable, oily liquid, H 2 O 2 , an aqueous solution of which is used chiefly as an antiseptic and a bleaching agent.

Origin:
1870–75

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World English Dictionary
hydrogen peroxide
 
n
a colourless oily unstable liquid, usually used in aqueous solution. It is a strong oxidizing agent used as a bleach for textiles, wood pulp, hair, etc, and as an oxidizer in rocket fuels. Formula: H2O2

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hydrogen peroxide n.
A colorless, heavy, strongly oxidizing liquid capable of reacting explosively with combustibles and used principally in aqueous solution as a mild antiseptic, a bleaching agent, an oxidizing agent, and a laboratory reagent. Also called hydroperoxide.

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 peroxide  
A colorless, dense liquid, that is often used as a bleach or is diluted with water for use as an antiseptic. Chemical formula: H2O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

hydrogen peroxide

(H2O2), a colourless liquid usually produced as aqueous solutions of various strengths, used principally for bleaching cotton and other textiles and wood pulp, in the manufacture of other chemicals, as a rocket propellant, and for cosmetic and medicinal purposes. Solutions containing more than about 8 percent hydrogen peroxide are corrosive to the skin

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Skip using hydrogen peroxide on the countertops, and add it to your laundry as
  a bleach alternative.
Use hydrogen peroxide as an alternative to bleach in your laundry room.
If you plan to clean with hydrogen peroxide, be sure to wear gloves when
  handling it.
Two other models, built for demo use only, run on hydrogen peroxide.
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