divider

noun

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

   noun.person

   Synonyms splitter

   Antonyms lumper

   Source: WordNet 3.0

2. a person who separates something into parts or groups

   noun.person

   Source: WordNet 3.0

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

   noun.artifact

   Synonyms partition

   Source: WordNet 3.0

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

   noun.artifact

   Source: WordNet 3.0

5. One who, or that which, divides; that which separates anything into parts.

   noun

   Source: webster1913