traitor
Concise Oxford English Dictionary © 2008 Oxford University Press:
traitor/ˈtreɪtə(r)/
▶noun a person who betrays their country, a cause, a person, etc.
– derivatives
traitorous adjective,
traitorously adverb.
traitorous adjective,
traitorously adverb.
– origin ME: from OFr. traitour, from L. traditor, from tradere ‘hand over’.
'traitor' also found in these Oxford entries:

