We found one dictionary that defines the word demonistic:

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1. demonistic: Wiktionary

Definitions from Wiktionary (demonistic) ▸ adjective:  Of or relating to demonism. ▸ Words similar to demonistic ▸ Usage examples for demonistic ▸ Idioms related to demonistic ▸ Wikipedia articles (New!) ▸ Popular nouns described by demonistic ▸ Words that often appear near demonistic ▸ Rhymes of demonistic ▸ Invented words related to demonistic