Gunpowder (noun)

1. A mixture of saltpeter, sulfur, and charcoal that is used as a propelling charge in firearms and as a blasting powder in fireworks and mining.
2. An explosive mixture of saltpeter, sulfur, and charcoal.

Origin:

From old english "gunnepowder" "gun powder".

Examples:

1. I found a bag of gunpowder in the garage.
2. The invention of gunpowder revolutionized warfare.
3. The fireworks were powered by gunpowder.
4. The miner used gunpowder to blast the rock.
5. The gunpowder was damp and wouldn't ignite.