Familiar Spirit is not in our dictionary (yet). Here's what it could mean:

Example Sentences

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But it was as Familiar Spirit, and in the pursuit of occult divination, that General Napoleon most frequently resorted to Sambo.

From The Suprising Adventures of Sir Toady Lion With Those of General Napoleon Smith by Crockett, S. R. (Samuel Rutherford)

If it can be proved, that the party hath entertained a Familiar Spirit, and had Conference with it, in the likeness of some visible Creatures; here is Evidence of witchcraft.

From The Wonders of the Invisible World Being an Account of the Tryals of Several Witches Lately Executed in New-England, to which is added A Farther Account of the Tryals of the New-England Witches by Mather, Cotton