syngraph

/siijgraef/ The name given by the canonists to deeds or other written instruments of which both parts were written on the same piece of parchment, with some word or letters of the alphabet written between them, through which the parchment was cut in such a manner as to leave half the word on one part and half on the other. It thus corresponded to the chirograph or indenture of the common law. 2 Bl.Comm. 295, 296.

Formerly such writings were attested by the subscription and crosses of the witnesses; afterwards, to prevent frauds and concealments, they made deeds of mutual covenant in a script and rescript, or in a part and counterpart, and in the middle between the two copies they wrote the word syngraphus in large letters, which, being cut through the parchment and one being delivered to each party, on being afterwards put together proved their authenticity. A deed, bond, or other written instrument under the hand and seal of all the parties. It was so called because the parties wrote together