/ ˌnɒm də ˈpluːm; NAmE ˌnɑːm/ noun
( pl. noms de plume / ˌnɒm də ˈpluːm; NAmE ˌnɑːm/) (from French ) a name used by a writer instead of their real name
SYN pen-name , pseudonym
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WORD ORIGIN
early 19th cent.: formed in English from French words, to render the sense pen-name , on the pattern of nom de guerre .