Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A polished, striated rock surface caused by one rock mass sliding over another in a fault plane.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A smooth, striated rock surface caused by the friction of one mass sliding over another

Etymologies

Dialectal slicken, glossy (alteration of slick) + side.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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