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proximity fuse

noun
1.
an electronically triggered device designed to detonate an explosive charge in a missile, etc, at a predetermined distance from the target
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for proximity fuse

an explosive ignition device used in bombs, artillery shells, and mines. The fuze senses when a target is close enough to be damaged or destroyed by the weapon's explosion. The sensor is typically a small radar set that sends out signals and listens for their reflections from nearby objects.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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