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The Collaborative International Dictionary
Transfuge

Transfuge \Trans"fuge\, Transfugitive \Trans*fu"gi*tive\, n. [L. transfuga; trans across, over + fugere to flee.] One who flees from one side to another; hence, a deserter; a turncoat; an apostate. [R.]

Wiktionary
transfuge

n. 1 (context dated English) A deserter. 2 (context dated English) A turncoat.