nom de plume
Concise Oxford English Dictionary © 2008 Oxford University Press:
nom de plume /ˌnɒm də ˈpluːm/
▶noun (pl. noms de plume pronunc. same) a pen name.
– origin C19: formed in Engl. from Fr. words, on the pattern of nom de guerre.
'nom de plume' also found in these Oxford entries:

