trough in WordNet English dictionary

1. a concave shape with an open top
   bowl  trough 
   
2. a channel along the eaves or on the roof; collects and carries away rainwater
   gutter  trough 
   
3. a container (usually in a barn or stable) from which cattle or horses feed
   manger  trough 
   
4. a treasury for government funds
   public treasury  trough  till 
   
5. a long narrow shallow receptacle
   trough 
   
6. a narrow depression (as in the earth or between ocean waves or in the ocean bed)
   trough