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[rim-rok] /ˈrɪmˌrɒk/
noun, Geology.
rock forming the natural boundary of a plateau or other rise.
bedrock forming the natural boundary of a placer or of a gravel deposit.
Origin of rimrock
An Americanism dating back to 1855-60; rim + rock1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for rimrock
Historical Examples
  • We followed along the ledge around the rimrock until we came to a little pass through.

    Pluck on the Long Trail

    Edwin L. Sabin
  • On either side were brownish red jagged peaks and rimrock faces, specked with snow.

    Pluck on the Long Trail

    Edwin L. Sabin
  • One after another they leaped over the edge of the rimrock until most of the flock was destroyed.

    The Story of Wool Sara Ware Bassett
  • The rimrock and the gravels above and below it constitute the Rattlesnake Formation.

British Dictionary definitions for rimrock


rock forming the boundaries of a sandy or gravelly alluvial deposit
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
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