proximity fuze

noun

Definition of proximity fuze 

: an electronic device that detonates a projectile within effective range of the target by means of the radio waves sent out from a tiny radio set in the nose of the projectile and reflected back to the set from the target

called also radio proximity fuze, variable time fuze, VT fuze

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First Known Use of proximity fuze

1940, in the meaning defined above

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The first known use of proximity fuze was in 1940

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