The Collaborative International Dictionary of English v.0.48:

Surplice \Sur"plice\, n. [F. surplis, OF. surpeiz, LL.
   superpellicium; super over + pellicium, pelliceum, a robe of
   fur, L. pellicius made of skins. See Pelisse.] (Eccl.)
   A white garment worn over another dress by the clergy of the
   Roman Catholic, Episcopal, and certain other churches, in
   some of their ministrations.
   [1913 Webster]

   Surplice fees (Eccl.), fees paid to the English clergy for
      occasional duties.
      [1913 Webster]

WordNet (r) 3.0 (2006):

surplice
    n 1: a loose-fitting white ecclesiastical vestment with wide
         sleeves