divider in WordNet English dictionary

1. a vertical structure that divides or separates (as a wall divides one room from another)
   partition  divider 
   
2. a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements
   divider 
   
3. a person who separates something into parts or groups
   divider 
   
4. a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics
   splitter  divider