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The Collaborative International Dictionary
Pseudepigraphy

Pseudepigraphy \Pseu`de*pig"ra*phy\, n. The ascription of false names of authors to works.

Douglas Harper's Etymology Dictionary
pseudepigraphy

"ascription of false authorship to a book," 1842, probably via German or French, from pseudo- + epigraph + -y (1). Related: Pseudepigrapha; pseudepigraphic (1830); pseudepigraphical (1838); pseudepigraphal (1630s).

Wiktionary
pseudepigraphy

n. the composition of pseudepigrapha, false credit of authorship to give ideas greater legitimacy