Webster’s Revised Unabridged Dictionary · 1913 Frett Frett (frĕt), n. [See 2d Fret.] (Mining) The worn side of the bank of a river. See 4th Fret, n., 4. Frett, n. [See Frit.] A vitreous compound, used by potters in glazing, consisting of lime, silica, borax, lead, and soda. ‹ Fretful Fretted ›