peneplain

 [pee-nuh-pleyn, pee-nuh-pleyn]  

pe·ne·plain

   [pee-nuh-pleyn, pee-nuh-pleyn]
noun Geology.
an area reduced almost to a plain by erosion.
Also, pe·ne·plane.

Origin:
1885–90; pene- + plain1

Related forms
pe·ne·pla·na·tion  [pee-nuh-pluh-ney-shuhn] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Peneplain is always a great word to know.
So is crust. Does it mean:
central portion of the earth believed to be composed mainly of iron and nickel in a molten state
outer layer of the earth, about 22 miles deep under the continents and 6 miles deep under the oceans
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Collins
World English Dictionary
peneplain or peneplane (ˈpiːnɪˌpleɪn, ˌpiːnɪˈpleɪn, ˈpiːnɪˌpleɪn, ˌpiːnɪˈpleɪn)
 
—n
a relatively flat land surface produced by a long period of erosion
 
[C19: from pene- + plain1]
 
peneplane or peneplane
 
—n
 
[C19: from pene- + plain1]
 
penepla'nation or peneplane
 
—n

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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