[ 'rɛnɪgeɪd ]
■ noun a person who deserts and betrays an organization, country, or set of principles.
↘ archaic a person who abandons religion.
■ adjective having treacherously changed allegiance.
■ verb archaic become a ~.
Origin
C15: from Sp. renegado , from med. L. renegatus , renegare 'renounce'.