Source : Webster's Revised Unabridged Dictionary (1913)

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.]

         He was, parde, an old fellow of yours.   --Chaucer.