Thundering; crackling; detonating; hurling menaces or censures. Fulminating powder, an explosive compound of nitre, carbonate of potash, and sulphur.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Thundering; exploding with a crack and flash.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective, noun) (a. / n.) (adjective / noun)

Usage examples:

It was merely an interesting question on which to expend the energy fulminating in his mind.
- The Snow-Burner by Henry Oyen
As regards himself, had he not, despite his services to his country, been relegated to a third- rate seaport, where his twenty- nine languages were quite useless, except for fulminating against the government!
- The Life of Sir Richard Burton by Thomas Wright
But Macquart interrupted her with a fulminating glance.
- The Fortune of the Rougons by Emile Zola