FRIT

frit. Frit, n. sand and alkali baked and calcined for making glass, but not melted

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Frit (?), n. [[F. fritte, fr. frit fried, p. p. of frire to fry. See Far, v. t.]] 1. 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.
2. 2. (Ceramics) The material for glaze of pottery.
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.