rod in WordNet English dictionary

1. a gangster's pistol
   gat  rod 
   
2. a linear measure of 16.5 feet
   perch  rod  pole 
   
3. a square rod of land
   perch  rod  pole 
   
4. a visual receptor cell that is sensitive to dim light
   rod  rod cell  retinal rod 
   
5. any rod-shaped bacterium
   rod 
   
6. a long thin implement made of metal or wood
   rod