What does fulminate mean?
To fulminate is to denounce something with thunderous, emphatic fury — to launch a storm of verbal protest rather than a measured argument. The word comes from the Latin fulminare, 'to strike with lightning', and retains that figurative flash-and-crash quality: someone who fulminates rails loudly, usually 'against' a policy, decision, or person they consider outrageous. Because it suggests noise and indignation more than persuasion, the word is often used with a hint of irony, describing critics whose outrage is theatrical or ineffective. It is largely formal or literary in register. Separately, 'fulminate' survives as a technical noun in chemistry: a fulminate is an unstable salt of fulminic acid, and mercury fulminate served for roughly a century as the standard explosive primer in percussion caps, cartridges, and blasting caps before being phased out. Both senses descend from the same lightning-bolt imagery, making this one of the few words equally at home in political rhetoric and explosives science.
To utter or send out denunciations with force and violence; to rail loudly against something.
"She would fulminate for hours about the decline of public broadcasting."
Typically followed by 'against'; conveys loud moral outrage rather than calm criticism.
A salt of fulminic acid; especially mercury fulminate, a sensitive explosive compound used historically in detonators and percussion primers.
"The old blasting caps contained pellets of mercury fulminate."
Chiefly found in chemistry, mining, and military-historical contexts.
Applies only to the chemical noun sense; the verb's third-person singular 'fulminates' is not a plural.
"Early chemists handled several unstable fulminates before safer primers were developed."
Before it meant shouting at people, 'fulminate' literally meant to strike like lightning — the same Latin word gave us mercury fulminate, the explosive that fired bullets for over a century.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fulminate
'Fulminate' derives from the Latin fulminare, 'to flash forth lightning', itself built on fulmen, meaning a thunderbolt. In medieval and Renaissance Latin the verb carried a figurative sense of issuing thunderous denunciations, and English adopted it in this metaphorical vein in the 15th–16th centuries. Its modern chemical sense arose in the 17th century after fulminating gold and later mercury fulminate were discovered, named for their explosive, lightning-like action. The noun 'fulmination' and agent noun 'fulminator' share the same Latin root.
Related word forms
How fulminate is actually used
The verb carries a formal, often slightly literary register and implies loudness and moral indignation rather than reasoned argument; critics sometimes use it dismissively of someone ranting ineffectually. It almost always takes the construction 'fulminate against'. The chemical noun sense belongs chiefly to technical and historical contexts, as mercury fulminate has largely been replaced by other priming compounds.
Easily confused with fulminate
"Fulsome" means excessively flattering or abundant in praise, while "fulminate" means to denounce loudly — nearly opposite connotations despite the similar sound.