Webster's English Dictionary

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frit

1. frit \'frit\ n [It fritta] 1: the calcined or partly fused materials of 
   which glass is made  2: glass variously compounded that is quenched and 
   ground as a basis for gl azes or enamels
2. frit vt or frit.ted;  or frit.ting : to prepare (materials for glass) by 
   heat