Source : Webster's Revised Unabridged Dictionary (1913)

Frett \Frett\, n. [See 2d {Fret}.] (Mining)
   The worn side of the bank of a river. See 4th {Fret}, n., 4.

Frett \Frett\, n. [See {Frit}.]
   A vitreous compound, used by potters in glazing, consisting
   of lime, silica, borax, lead, and soda.