What does detonator mean?
A detonator is a device — usually a small explosive charge such as a blasting cap — used to set off a larger, more powerful explosion. Because many commercial and military explosives are deliberately insensitive to heat, friction, or shock, they require the sharp, concentrated energy of a detonator to begin their reaction. Detonators come in several forms: plain blasting caps ignited by a safety fuse, electric detonators fired by current, and delay detonators engineered to fire at precise intervals, which allows complex demolition sequences to unfold step by step. The word belongs chiefly to technical registers — mining, quarrying, construction, and ordnance — and appears frequently in news reporting about explosives. Figuratively, it can describe anything that triggers a sudden chain of events, though this extended use is far rarer than near-synonyms like trigger or catalyst.
nounA small device or explosive charge used to trigger a larger explosion, typically by initiating the main detonator charge in a bomb or blasting operation.
- A device or small explosive charge used to initiate a larger explosion.
- (Figurative/rare) Something that triggers or sets off a chain of events.
"The miners attached a detonator to each charge before clearing the site."
"The demolition crew wired each detonator carefully before the controlled implosion."
"His resignation acted as a detonator for a wave of reforms across the company."
Standard regular plural; used when referring to multiple devices.
"The technicians inspected all the detonators before the blast."
Without a detonator, most modern explosives are surprisingly stable — TNT won't even explode from a direct bullet impact; it needs that tiny kick to go off.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of detonator
"Detonator" derives from the Latin verb detonare, meaning "to thunder down" or "to thunder forth," formed from de- ("down") plus tonare ("to thunder"). It entered English in the 19th century alongside related forms like detonate and detonation, as the science of explosives developed during the industrial era. Cognates appear across European languages, including French détonateur and Spanish detonador, all tracing back to the same Latin root shared with English words like intone and tone.
Related word forms
How detonator is actually used
"Detonator" is primarily a technical term used in mining, demolition, military, and engineering contexts. It carries connotations of precision and danger. The figurative sense (something that sparks events) is much less common than "catalyst" or "trigger" and should be used sparingly.
Easily confused with detonator
A denominator is the bottom number of a fraction, whereas a detonator is an explosive triggering device.