[′sōd·ē·əm ə¦lü·mə·nō′sil·ə‚kāt] (inorganic chemistry) White, amorphous powder or beads of variable stoichiometry, partially soluble in strong acids and alkali hydroxide solutions between 80 and 100°C; used in food as an anticaking agent. Also known as sodium silicoaluminate.