Slick'en-sides, n.

n. 1. The smooth striated or partially polished surfaces of a fissure, or seam, supposed to be produced by the sliding of one surface on another. Dana.

2. A variety of galena in Derbyshire;—so called by workmen. Ure.
3. A vein of clay which intersects a lode so as to cause a vertical dislocation in it;—called also slide.