The Collaborative International Dictionary of English v.0.48:

Frit \Frit\, v. t. [imp. & p. p. Fritted; p. pr. & vb. n.
   Fritting.]
   To prepare by heat (the materials for making glass); to fuse
   partially. --Ure.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Frit \Frit\, v. t.
   To fritter; -- with away. [R.] --Ld. Lytton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Frit \Frit\ (fr[i^]t), n. [F. fritte, fr. frit fried, p. p. of
   frire to fry. See Far, v. t.]
   1. (Glass Making) The material of which glass is made, after
      having been calcined or partly fused in a furnace, but
      before vitrification. It is a composition of silex and
      alkali, occasionally with other ingredients. --Ure.
      [1913 Webster]

   2. (Ceramics) The material for glaze of pottery.
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   Frit brick, a lump of calcined glass materials, brought to
      a pasty condition in a reverberatory furnace, preliminary
      to the perfect vitrification in the melting pot.
      [1913 Webster]