proximity fuse

(ordnance) A fuse that detonates a warhead when the target is within some specified region near the fuse; radio, radar, photoelectric, or other devices may be used as activating elements. Also known as influence fuse; variable-time fuse; vt fuse.

An electronic detonator that causes a projectile to explode when it comes within a preset distance of its target.

See the Introduction, Abbreviations and Pronunciation for further details.