Etymology
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gunpowder (n.)

"explosive powder for the discharge of projectiles from guns," early 15c., from gun (n.) + powder (n.). The Gunpowder Plot (or treason or conspiracy) was a plan to blow up the Houses of Parliament on Nov. 5, 1605, while the King, Lords and Commons were assembled there in revenge for the laws against Catholics (see guy (n.2)).

updated on April 30, 2015

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Definitions of gunpowder from WordNet

gunpowder (n.)
a mixture of potassium nitrate, charcoal, and sulfur in a 75:15:10 ratio which is used in gunnery, time fuses, and fireworks;
Synonyms: powder
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.