/ ˌnɒm də ˈgeə(r); NAmE ˌnɑːm də ˈger/ noun
( pl. noms de guerre / ˌnɒm də ˈgeə(r); NAmE ˌnɑːm də ˈger/) (from French , formal ) a false name that is used, for example, by sb who belongs to a military organization that is not official
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WORD ORIGIN
French , literally war name .