Saundyuer

sb. the fatty substance floating on glass when it is red-hot in the furnaceVariants: sawndevere, sandiverEtymology: Old French suin de verre, the sweating of glass; suin or suint, from suinter, to sweat, as stones in moist weather; nasalised from Old Teutonic (as restored by scholars) base , whence G. schwitzen, to sweat.