WordReference Random House Learner's Dictionary of American English © 2015
trai•tor /ˈtreɪtɚ/USA pronunciation n. [countable] one who betrays. trai•tor•ous, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

traitor /ˈtreɪtə/ n
  1. a person who is guilty of treason or treachery, in betraying friends, country, a cause or trust, etc
Etymology: 13th Century: from Old French traitour, from Latin trāditor traditor

ˈtraitorous adj ˈtraitress fem n

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