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defector

[dih-fek-ter]
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noun
  1. a person who defects from a cause, country, alliance, etc.

Origin of defector

1655–65; < Latin dēfector renegade, rebel, equivalent to dēfec- (variant stem of dēficere to become disaffected, revolt, literally, to fail; see defect) + -tor -tor
Related formsnon·de·fec·tor, nounre·de·fec·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for defector

n.

1660s, agent noun in Latin form from defect, or else from Latin defector "revolter," agent noun from deficere (see deficient).

Online Etymology Dictionary, © 2010 Douglas Harper