The Collaborative International Dictionary of English v.0.48:

Delf \Delf\ (d[e^]lf), n. [AS. delf a delving, digging. See
   Delve.]
   A mine; a quarry; a pit dug; a ditch. [Written also delft,
   and delve.] [Obs.]
   [1913 Webster]

         The delfts would be so flown with waters, that no gins
         or machines could . . . keep them dry.   --Ray.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

delft \delft\ (d[e^]lft), n.
   Same as Delftware.
   [1913 Webster]

WordNet (r) 3.0 (2006):

delft
    n 1: a style of glazed earthenware; usually white with blue
         decoration