Look up grist in Wiktionary, the free dictionary.
Grist is grain that has been separated from its chaff in preparation for grinding. It can also mean grain that has been ground at a gristmill. Its etymology derives from the verb grind.
Grist can be ground into meal or flour, depending on how coarsely it is ground. Maize made into grist is called grits when it is coarse, and corn meal when it is finely ground. Wheat, oats, barley, and buckwheat are also ground and sifted into flour and farina. Grist is also used in brewing and distillation to make a mash.