thunder in WordNet English dictionary

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

1. be the case that thunder is being heard
   "Whenever it thunders, my dog crawls under the bed"
   thunder  boom 
   
2. utter words loudly and forcefully
   "`Get out of here,' he roared"
   thunder  roar 
   
3. to make or produce a loud noise
   "The river thundered below"; "The engine roared as the driver pushed the car to full throttle"
   thunder 
   
4. move fast, noisily, and heavily
   "The bus thundered down the road"
   thunder