An electrically fired thunderflash, set off in a steel tank fitted with a wire mesh top, to simulate an explosion.
These are so loud that it is as well to inform the police in advance if one is to be set off (and at what time), so that they can be ready to deal with hundeds of reports of bombs going off.
The heavy metal band 'Maroon' takes its namesake from this word as well as many college newspapers around the country
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