Found 2 items, similar to gritstone.
English → English (WordNet) Definition: gritstone gritstone n : a hard coarse-grained siliceous sandstone [syn: grit, gritrock]
English → English (gcide) Definition: gritstone Grit \Grit\, n. [OE, greet, greot, sand, gravel, AS. gre['o]t grit, sant, dust; akin to OS griott, OFries. gret gravel, OHG. grioz, G. griess, Icel. grj[=o]t, and to E. groats, grout. See Groats, Grout, and cf. Grail gravel.] 1. Sand or gravel; rough, hard particles. [1913 Webster] 2. The coarse part of meal. [1913 Webster] 3. pl. Grain, esp. oats or wheat, hulled and coarsely ground; in high milling, fragments of cracked wheat smaller than groats. [1913 Webster] 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. [1913 Webster] 5. Structure, as adapted to grind or sharpen; as, a hone of good grit. [1913 Webster] 6. Firmness of mind; invincible spirit; unyielding courage; fortitude. --C. Reade. --E. P. Whipple. [1913 Webster]