high explosive

noun high explosives

1. A chemical explosive capable of detonation rather than solely of deflagration; a chemical explosive capable of reacting at a sufficiently-fast rate to produce a shock wave which propagates the reaction throughout the explosive mass; a chemical explosive capable of producing an explosion even when unconfined. Having completed their task, Fireman Page telephoned from a lineside box to the next signal cabin, briefly reported the incident and said that, as no high explosive had dropped and the track was safe, they proposed proceeding "at caution".