What is "crizzle"

Crizzel \Criz"zel\ (kr[i^]z"z'l), n. [Cf. grizzle darkish gray, or G. griselig gravelly, granular, speckled.] A kind of roughness on the surface of glass, which clouds its transparency. [Written also crizzeling and crizzle.]

n. A roughened surface, especially one on glass that clouds its transparency. vb. To roughen on the surface.