|änə|mastik adjective
Etymology: Greek onomastikos, from onomazein to name, from onoma name — more at name
1. : of, relating to, or consisting of a name or names
published an onomastic study
2. of a signature : written in the handwriting of the author of a letter or document or in the handwriting of one subscribing to a letter or document the body of which is in the handwriting of another person