The study, theory, or discourse concerning the devil, demons, or diabolic matters.
From Greek diabolo- (relating to the devil) + -logia (discourse or study), following the pattern of words like 'theology' (study of God) or 'biology' (study of life).
Diabology is a rare scholarly term showing how -logy (from Greek logos, 'word' or 'study') became English's favorite suffix for naming academic disciplines—we can study literally anything by adding -logy!
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