perchloric acid

noun Chemistry.
a colorless, syrupy hygroscopic liquid, HClO 4 , an acid of chlorine containing one more oxygen atom than chloric acid: used chiefly as a reagent in analytical chemistry.

Origin:
1810–20

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Collins
World English Dictionary
perchloric acid (pəˈklɔːrɪk) [Click for IPA pronunciation guide]
 
n
Systematic name: chloric(VII) acid a colourless syrupy oxyacid of chlorine containing a greater proportion of oxygen than chloric acid. It is a powerful oxidizing agent and is used as a laboratory reagent. Formula: HClO4

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Perchloric acid is always a great word to know.
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an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
American Heritage
Medical Dictionary

perchloric acid per·chlo·ric acid (pər-klôr'ĭk)
n.
A clear colorless liquid that is the highest in oxygen content of the series of chlorine acids and is a powerful oxidant used as a catalyst.

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
perchloric acid   (pər-klôr'ĭk)  Pronunciation Key 
A clear, colorless liquid that is very corrosive and, under some conditions, extremely explosive. It is a powerful oxidant and is used as a catalyst and in explosives. Chemical formula: HClO4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Perform all perchloric acid digestions in a perchloric acid fume hood.
Hydrogen peroxide and perchloric acid are commonly found in research
  laboratories.
Because perchloric acid is potentially explosive, use of phosphoric acid
  instead is also common.
Hydrochloric acid and perchloric acid can damage the skin.
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