fil·i·gree 
(fĭlĭ-grē′)
(fĭlĭ-grē′)n.
1. Delicate and intricate ornamental work made from gold, silver, or other fine twisted wire.
2.
a. An intricate, delicate, or fanciful ornamentation.
b. A design resembling such ornamentation: filigrees of frosting on a cake.
tr.v. fil·i·greed, fil·i·gree·ing, fil·i·grees
To decorate with or as if with filigree.
[Alteration of French filigrane, from Italian filigrana : Latin fīlum, thread; see gwhī- in the Appendix of Indo-European roots + Latin grānum, grain; see gə-no- in the Appendix of Indo-European roots.]