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riprap

[rip-rap] /ˈrɪpˌræp/
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
1570-1580
1570-80; gradational reduplication of rap1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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