ETYMOLOGY
from allo- (comb. form) + ‑nymous, perhaps after French allonyme (see allonym n.).
EXAMPLE
“… With regard to their authors, books are
(1.) Allonymous; those published under the real name of some author of reputation, to whom consequently works are attributed which he never composed. – Such was the Book on Antiquities published by Annius of Viterbo, at Rome, in 1498, in folio; and again in 1542, in octavo. In this compilation, Annius has been charged with fabricating works falsely attributed to Xenophon, Philo, and other antient authors. …”
From: An Introduction to the Study of Bibliography: to which is Prefixed a Memoir on the Public Libraries of the Antients
By Thomas Hartwell Horne, 1814
PRONUNCIATION
al-ON-uh-muhss
Lexicophilia 