riprap

[rip-rap]
noun
1.
a quantity of broken stone for foundations, revetments of embankments, etc.
2.
a foundation or wall of stones thrown together irregularly.
verb (used with object), riprapped, riprapping.
3.
to construct with or strengthen by stones, either loose or fastened with mortar.

Origin:
1570–80; gradational reduplication of rap1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Riprap may be required along the base of the eroded area to prevent further
  undercutting of the bank.
Procedures are also presented for riprap protection at bridge piers and
  abutments.
Several riprap sizes will be evaluated in order to develop a predictive
  equation for riprap stability in a culvert.
The riprap is angular, quarried rock, and the bedding is rounded stream gravel.
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