a person or thing that splits.
Biology Informal. a taxonomist who believes that classifications should emphasize differences between organisms and therefore favors a multiplicity of taxa (opposed to lumper ).

1615–25; split + -er1

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World English Dictionary
split (splɪt)
vb (when tr, often foll by up) (usually foll by on) , splits, splitting, split
1.  to break or cause to break, esp forcibly, by cleaving into separate pieces, often into two roughly equal pieces: to split a brick
2.  to separate or be separated from a whole: he split a piece of wood from the block
3.  to separate or be separated into factions, usually through discord
4.  (often foll by up) to separate or cause to separate through a disagreement
5.  to divide or be divided among two or more persons: split up the pie among the three of us
6.  slang to depart; leave: let's split; we split the scene
7.  (tr) to separate (something) into its components by interposing something else: to split a word with hyphens
8.  slang to betray the trust, plans, etc (of); inform: he split on me to the cops
9.  (US) (tr) politics to mark (a ballot, etc) so as to vote for the candidates of more than one party: he split the ticket
10.  (tr) to separate (an animal hide or skin) into layers
11.  split hairs to make a fine but needless distinction
12.  split one's sides to laugh very heartily
13.  split the difference
 a.  to settle a dispute by effecting a compromise in which both sides give way to the same extent
 b.  to divide a remainder equally
14.  the act or process of splitting
15.  a gap or rift caused or a piece removed by the process of splitting
16.  a breach or schism in a group or the faction resulting from such a breach
17.  a dessert of sliced fruit and ice cream, covered with whipped cream, nuts, etc: banana split
18.  See Devonshire split
19.  a.  a separated layer of an animal hide or skin other than the outer layer
 b.  leather made from such a layer
20.  tenpin bowling a formation of the pins after the first bowl in which there is a large gap between two pins or groups of pins
21.  informal an arrangement or process of dividing up loot or money
22.  having been split; divided: split logs
23.  having a split or splits: hair with split ends
[C16: from Middle Dutch splitten to cleave; related to Middle High German splīzen; see splice]

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Example sentences
Use a hose splitter to route lengths of hose along all branches of the trench.
If the photons from the two ions are in the same state, the beam splitter will
  shunt both to one photodetector.
The standard oxide can is raised to the necessary height above the batch
  splitter and inverted.
The beam splitter is represented by the thin vertical lines.
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