Myrmomancy

Myrmomancy, a form of Entomomancy, is a divination by interpreting the appearance and behaviour of ants, particularly their eating habits.

Etymology

Derived from the Greek murmex ('ant') and manteia ('prophecy')

See Also:

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Earth Divination: Earth Magic: Practical Guide to Geomancy - John Michael Greer
Divination for Beginners: Reading the Past, Present & Future -Scott Cunningham