slickenside

[slik-uhn-sahyd]

slick·en·side

[slik-uhn-sahyd]
noun Geology.
a rock surface that has become more or less polished and striated by slippage along a fault plane.

Origin:
1760–70; slick2 + -en3 + side1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Slickenside is always a great word to know.
So is percolation. Does it mean:
slow movement of water through the pores in soil or permeable rock
central portion of the earth believed to be composed mainly of iron and nickel in a molten state
Collins
World English Dictionary
slickenside (ˈslɪkənˌsaɪd)
 
n
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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