noun Geology.
a rock surface that has become more or less polished and striated by slippage along a fault plane.

1760–70; slick2 + -en3 + side1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slickenside (ˈslɪkənˌsaɪd)
a rock surface with a polished appearance and fine parallel scratches caused by abrasion during fault displacement
[C18: from dialect slicken, variant of slick + side]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
slickenside   (slĭk'ən-sīd')  Pronunciation Key 
A polished, striated rock surface formed by one rock mass sliding over another in a fault plane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Display slickenside lineations on low-angle normal dip-slip faults.
Intervals reveal slickenside features, many of which are mineral filled.
Throughout the entry, shale had commonly fallen out to bedding-parallel polished slickenside surfaces.
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