boric acid

noun
1.
Also called orthoboric acid. Chemistry, Pharmacology. a white, crystalline acid, H 3 BO 3 , occurring in nature or prepared from borax: used chiefly in the manufacture of ceramics, cements, glass, and enamels, for fireproofing, and in medicine in aqueous solution as a mild antiseptic.
2.
Chemistry. any of a group of acids containing boron.

Origin:
1865–70

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World English Dictionary
boric acid
 
n
1.  Also called: orthoboric acid, Systematic name: trioxoboric(III) acid a white soluble weakly acid crystalline solid used in the manufacture of heat-resistant glass and porcelain enamels, as a fireproofing material, and as a mild antiseptic. Formula: H3BO3
2.  any other acid containing boron

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American Heritage
Medical Dictionary

boric acid bo·ric acid (bôr'ĭk)
n.
A water-soluble white or colorless crystalline compound used as an antiseptic and preservative.

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
boric acid   (bôr'ĭk)  Pronunciation Key 
A white or colorless crystalline compound that occurs naturally or is produced artificially from borax. It is used as an antiseptic and preservative, and in cements, enamels, and cosmetics. Chemical formula: H3BO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Boric acid is a strong neutron absorber which will help prevent the nuclear
  fuel from overheating.
The seawater was also laced with boric acid, to soak up stray neutrons that the
  control rods missed.
In the three months, inspectors have found that boric acid has eaten a hole in
  the thick cap that covers the reactor vessel.
Boric acid should be reconsidered as a control for fire ants.
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