What is "allonym"

Allonym \Al"lo*nym\, n. [F. allonyme, fr. Gr. ? other + ? name.]

1. The name of another person assumed by the author of a work.

2. A work published under the name of some one other than the author.

n. 1 A pseudonym, (context: particularly) another person's name used as a pseudonym by the author of a work. 2 (context: uncommon) An allonymous work: a book published under the name of a person other than its true author.