Source : Webster's Revised Unabridged Dictionary (1913)

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.

Fritting \Frit"ting\, n. [See {Frit} to expose to heat.]
   The formation of frit or slag by heat with but incipient
   fusion.

Source : WordNet®

fritting
     See {frit}