轟発ごうはつ Noun Irregular Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb rare term loud explosion;thunderous blast 2 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru transitive verb rare term firing (a cannon, etc.) with a loud bang