[grog] n [Old Grog, nickname of Edward Vernon d. 1757 Eng. admiral responsible for diluting the sailors' rum] (1770) 1: alcoholic liquor; esp: liquor (as rum) cut with water and now often served hot with lemon juice and sugar sometimes added
2: refractory materials (as crushed pottery and firebricks) used in the manufacture of refractory products (as crucibles) to reduce shrinkage in drying and firing