term:

Holograph

holograph n

[Late Latin holographus, from Late Greek holographos, from Greek holos whole, complete + graphein to write]
: a document (as a will or a deed) entirely in the handwriting of the person whose act it purports to be
ho·lo·graph·ic [hō-lə-gra-fik, hÄ -]
adj

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.