The Appendix of the Omnidoxy is the post-disquisitional segment of the Omnidoxy making up 460,000 words and principally includes The Grand Lexicon of Astronology, the Omnidoxical Encyclopaedia of Astronism, and the Glossary of the Omnidoxy. This segment comprises a significant portion of the entire Omnidoxy, just under one quarter of the entire text and is classified as the Peripheral Omnidoxy alongside the Preppendix of the Omnidoxy which resides before The Twelve Grand Disquisitions.