Wiktionary
refractories
n. (plural of refractory English)
Usage examples of "refractories".
Their shielding fields blazed white, their refractories wavered in the high blue as the overdriven refrigerators strove mightily to cope with the terrific load.
The refractories were of neo-carballoy, backed and permeated by M K R fields.
That gives you all the refractories would handle, if we set it up down in the old pit under the building—you know, where they had the annealing oven.