GRAYSTONE
Gray"stone`, n. (Geol.)
Defn: A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt.
GRAYWACKE
Gray"wacke`, n. Etym: [G. grauwacke; grau gray + wacke wacke. See
Gray, and Wacke, and cf. Grauwacke.] (Geol.)
Defn: A conglomerate or grit rock, consisting of rounded pebbles sand firmly united together.
Note: This term, derved from the grauwacke of German miners, was formerly applied in geology to different grits and slates of the Silurian series; but it is now seldom used.
GRAZE
Graze, v. t. Etym: [imp. & p. p. Grazed (p. pr. & vb. n. Grazing.]
Etym: [OE. grasen, AS. grasian, fr. grs grass. See Grass.]
1. To feed or supply (cattle, sheep, etc.) with grass; to furnish pasture for. A field or two to graze his cows. Swift.
2. To feed on; to eat (growing herbage); to eat grass from (a pasture); to browse. The lambs with wolves shall graze the verdant mead. Pope.
3. To tend (cattle, etc.) while grazing. When Jacob grazed his uncle Laban's sheep. Shak.
4. To rub or touch lightly the surface of (a thing) in passing; as, the bullet grazed the wall.