The Collaborative International Dictionary of English v.0.48:

Rescription \Re*scrip"tion\ (r?-skr?p"sh?n), n. [L. rescriptio:
   cf. F. rescription. See Rescribe.]
   A writing back; the answering of a letter. --Loveday.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

RESCRIPTION, French law. A rescription is a letter by which the maker
requests some one to pay a certain sum of money, or to account for him to a
third person for it. Poth. Du Contr. de Change, n. 225.
     2. According to this definition, bills of exchange are a species of
rescription. The difference appears to be this, that a bill of exchange is
given when there has been a contract of exchange between the drawer and the
payee; whereas the rescription is sometimes given in payment of debt, and at
other times it is lent to the payee. Id.