WordWeb Online

1. A deep prolonged loud noise
   - boom, roar, roaring
    
2. A booming or crashing noise caused by air expanding along the path of a bolt of lightning
    
3. [slang] A street name for heroin
   - big H [slang], hell dust [slang], nose drops [slang], smack [slang], skag [slang], scag [slang]

1. Move fast, noisily, and heavily
   "The bus thundered down the road"
    
2. Utter words loudly and forcefully
   "'Get out of here,' he thundered";
   - roar
    
3. Be the case that thunder is being heard
   "Whenever it thunders, my dog crawls under the bed";
   - boom
    
4. To make or produce a loud noise
   "The river thundered below"

Derived forms: thundered, thundering, thunders

Type of: diacetylmorphine, diamorphine, heroin, howl, junk [informal], move, noise, roar, shout

Encyclopedia: Thunder, Lightning and Sunshine