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peneplain

or pe·ne·plane

[pee-nuh-pleyn, pee-nuh-pleyn]
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noun Geology.
  1. an area reduced almost to a plain by erosion.
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Origin of peneplain

First recorded in 1885–90; pene- + plain1
Related formspe·ne·pla·na·tion [pee-nuh-pluh-ney-shuh n] /ˌpi nə pləˈneɪ ʃən/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for peneplanation

peneplain

peneplane

noun
  1. a relatively flat land surface produced by a long period of erosion
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Derived Formspeneplanation, noun

Word Origin

C19: from pene- + plain 1
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