The Collaborative International Dictionary of English v.0.48:

Tiffany \Tif"fa*ny\, n. [OE. tiffenay; cf. OF. tiffe ornament,
   tiffer to adjust, adorn. See Tiff to dress.]
   A species of gause, or very silk.
   [1913 Webster]

         The smoke of sulphur . . . is commonly used by women to
         whiten tiffanies.                        --Sir T.
                                                  Browne.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tiffany \Tif"fa*ny\, a. [After Louis Comfort Tiffany.]
   1. made of stained glass by, or in the style of objects made
      by, Louis C. Tiffany; as, a Tiffany lamp.
      [PJC]

   2. Made by or purchased from the Tiffany corporation (with
      headquarters in New York City); as, Tiffany jewelry.
      [PJC]

WordNet (r) 3.0 (2006):

Tiffany
    n 1: United States artist who developed Tiffany glass
         (1848-1933) [syn: Tiffany, Louis Comfort Tiffany]