PSEUDONYMOUS
pseudonymous
(adjective) bearing or identified by an assumed (often pen) name; “the writings of Mark Twain are pseudonymous”
Source: WordNet® 3.1
Etymology
Adjective
pseudonymous (comparative more pseudonymous, superlative most pseudonymous)
Of or pertaining to a pseudonym.
(of a name) Fictitious.
That uses a pseudonym.
Source: Wiktionary
Pseu*don"y*mous, a. Etym: [Gr. pseudonyme. See Pseudo-, and Name.]
Definition: Bearing a false or fictitious name; as, a pseudonymous work.
– Pseu*don"y*mous*ly, adv.
– Pseu*don"y*mous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition