allonym

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al·lo·nym

A0214900 (ăl′ə-nĭm′)n. The name of a person, usually a historical person, assumed by a writer.
[French allonyme : Greek allos, other; see allo- + Greek onoma, name; see nō̆-men- in Indo-European roots.]
al·lon′y·mous (ə-lŏn′ə-məs) adj.al·lon′y·mous·ly adv.

allonym

(ˈælənɪm) n (Literary & Literary Critical Terms) a name, often one of historical significance or that of another person, assumed by a person, esp an author