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3. pl. Grain, esp. oats or wheat, hulled and coarsely ground; in high
milling, fragments of cracked wheat smaller than groats.
4. (Geol.) A hard, coarse-grained siliceous sandstone; as, millstone
grit; -- called also gritrock and gritstone. The name is also applied
to a finer sharp-grained sandstone; as, grindstone grit.