divider

noun

1. 1

   a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements

2. 2

   a vertical structure that divides or separates (as a wall divides one room from another)

3. 3

   a person who separates something into parts or groups

4. 4

   a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics