an explosive mixture, as of potassium nitrate, sulfur, and charcoal, used in shells and cartridges, in fireworks, for blasting, etc.
Also called gunpowder tea. a fine variety of green China tea, each leaf of which is rolled into a little ball.

1375–1425; late Middle English; see gun1, powder1

gunpowdery, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gunpowder (ˈɡʌnˌpaʊdə)
Also called: black powder an explosive mixture of potassium nitrate, charcoal, and sulphur (typical proportions are 75:15:10): used in time fuses, blasting, and fireworks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1411, from gun + powder. The Gunpowder Plot was the conspiracy to blow up the Houses of Parliament on Nov. 5, 1605, while the King, Lords and Commons were assembled there.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Invention of the stirrup may rival that of the longbow and gunpowder.
Gunpowder could be used for a primitive form of internal combustion engine.
The brothers survived the frigid winters on plentiful game, waiting out the war
  until they ran out of gunpowder.
And yes, some of us made gunpowder and other explosives.
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