frits / fritz [frɪtz]
frits – n. pl. & 3rd pers. pres. of frit – 1. calcinated mixture of silica and fluxes, which can be melted to make glass; 2. a vitreous composition from which soft porcelain enamel, etc., are made; v. tr. – make into frit, partially fuse, calcine
fritz – n. – North American slang on the fritz, out of order, broken, defective