Lewis & Short

chīrŏgrăphārĭus, a, um, adj. [chirographum], pertaining to handwriting, manuscript-: creditores, who have the obligation of the debtor in his own handwriting, Dig. 42, 5, 38, § 1: pecunia, Cod. Just. 4, 2, 17: debitum, ib. 8, 27, 1.