Anonym
Pronunciation : An"o*nym
Part of Speech : n.
Etymology : [F. anonyme. See Anonymous.]
Definition : 1. One who is anonymous; also sometimes used for "pseudonym."
2. A notion which has no name, or which can not be expressed by a single English word. [R.] J. R. Seeley.
Source : Webster's Unabridged Dictionary, 1913