Definition of nom de plume noun from the Oxford Advanced Learner's Dictionary

 

nom de plume

 noun
noun
BrE BrE//ˌnɒm də ˈpluːm//
 
; NAmE NAmE//ˌnɑːm də ˈpluːm//
 
(pl. noms de plume
BrE BrE//ˌnɒm də ˈpluːm//
 
; NAmE NAmE//ˌnɑːm də ˈpluːm//
 
)
(from French)
 
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a name used by a writer instead of their real name synonym pen name, pseudonym Word Origin early 19th cent.: formed in English from French words, to render the sense ‘pen-name’, on the pattern of nom de guerre.
See the Oxford Advanced American Dictionary entry: nom de plume