What does "chirograph" mean?

Chirograph: (a) A writing which, reguiring a counterpart, was engrossed twice on the same piece of parchment, with a space between, in which was written the word chirographum, through which the parchment was cut, and one part given to each party. It answered to what is now called a charter party. (b) The last part of a fine of land, commonly called the foot of the fine. Bouvier.