1. a device, as a percussion cap, used to make another substance explode.
  2. something that explodes.


  1. a small amount of explosive, as in a percussion cap, used to initiate a larger explosion
  2. a device, such as an electrical generator, used to set off an explosion from a distance
  3. a substance or object that explodes or is capable of exploding

1822, agent noun in Latin form from detonate. For suffix, see -er (1).

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