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ornithomancy

noun
or·​nith·​o·​man·​cy | \ȯ(r)ˈnithəˌman(t)sē\
plural -es

Definition of ornithomancy 

: divination by observation of the flight of birds : augury

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History and Etymology for ornithomancy

Greek ornithomanteia, from ornith- + -manteia -mancy

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