The Collaborative International Dictionary of English v.0.48:

Valenciennes lace \Va*len`ci*ennes" lace"\ [F.; -- so called
   after the town of Valenciennes.]
   A rich kind of lace made at Valenciennes, in France. Each
   piece is made throughout, ground and pattern, by the same
   person and with the same thread, the pattern being worked in
   the net.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Valenciennes lace
    n 1: a type of bobbin lace with floral patterns [syn:
         Valenciennes, Valenciennes lace]