to thunder; hence, to make a loud, sudden noise; to detonate; to explode with a violent report.-to issue or send forth decrees or censures with the assumption of supreme authority; to thunder forth menaces.-to cause to explode.-to utter or send out with denunciations or censures; -- said especially of menaces or censures uttered by ecclesiastical authority.-a salt of fulminic acid. see under fulminic.-a fulminating powder.