Entry 2 senses · 2 variants Webster, 1913 Frett /frĕt/ · IPA /frˈɛt/ n. n. 01 n. The worn side of the bank of a river. See 4th Fret, n., 4. 1. The worn side of the bank of a river. See 4th Fret, n., 4.(Mining) See: Fret 02 n. A vitreous compound, used by potters in glazing, consisting of lime, silica, borax, lead, and soda. 1. A vitreous compound, used by potters in glazing, consisting of lime, silica, borax, lead, and soda.