The Collaborative International Dictionary of English v.0.48:

Parde \Par*de"\, Pardie \Par*die"\, adv. or interj. [F. pardi,
   for par Dieu by God.]
   Certainly; surely; truly; verily; -- originally an oath.
   [Written also pardee, pardieux, perdie, etc.] [Obs.]
   [1913 Webster]

         He was, parde, an old fellow of yours.   --Chaucer.
   [1913 Webster]