divider

noun

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