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Webster 1913 Edition

Noun.

One in subjection to a demon, or to demons.

[R.]

Sir T. Herbert.

Noun.

[Gr. Demon and law.] One that lives in subjection to the devil, or to evil spirits.

demonomist ‎(plural demonomists)

(archaic) One in subjection to a demon or demons.
(Can we find and add a quotation of Sir T. Herbert to this entry?)