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The Collaborative International Dictionary
Deviator

Deviator \De"vi*a`tor\, n. [L., a forsaker.] One who, or that which, deviates.

Wiktionary
deviator

n. That which deviates, or causes deviation

Usage examples of "deviator".

Some said that the missiles that spawned the genetic horrors that were stickies also held some secret chromo-somic deviator that accounted for the peculiar nightmare that they had become.