5 definitions found for Gritstone

Gritstone GRIT'STONE,n. [See Grit.]

gritstone n 1: a hard coarse-grained siliceous sandstone [syn: grit, gritrock, gritstone]

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. 5. Structure, as adapted to grind or sharpen; as, a hone of good grit. 6. Firmness of mind; invincible spirit; unyielding courage; fortitude. --C. Reade. E. P. Whipple.

Gritrock Grit"rock` (gr[i^]t"r[o^]k`), Gritstone Grit"stone` (-st[=o]n`)n. (Geol.) See Grit, n., 4.

gritstone n. Grit, gritrock.