Arachnomancy Definition

noun

The study of the appearance and behavior of spiders, or the patterns of their webs (possibly related to the third meaning) for use in divination.

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The ability to take control over spiders with the intent to use them for attacking purposes or similar purposes.

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Also the divination of patterns, for example in geometric patterns, and tapestries.

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Possibly also the creation of a view using scientific results by separating, and combining of new research.

Wiktionary

Origin of Arachnomancy