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slickenside

[slik-uh n-sahyd]
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noun Geology.
  1. a rock surface that has become more or less polished and striated by slippage along a fault plane.
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Origin of slickenside

First recorded in 1760–70; slick2 + -en3 + side1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for slickenside

slickenside

noun
  1. a rock surface with a polished appearance and fine parallel scratches caused by abrasion during fault displacement
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Word Origin

C18: from dialect slicken, variant of slick + side
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
slickenside in Science

slickenside

[slĭk′ən-sīd′]
  1. A polished, striated rock surface formed by one rock mass sliding over another in a fault plane.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.