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rip-rap

noun
1.
(civil engineering) broken stones loosely deposited in water or on a soft bottom to provide a foundation and protect a riverbed or river banks from scour: used for revetments, embankments, breakwaters, etc
Word Origin
C19: reduplication of rap1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for rip-rap
n.

also riprap, "loose stone thrown down in water or soft ground as foundation," 1822, American English, perhaps connected with earlier nautical word rip-rap meaning "stretch of rippling water" (often caused by underwater elevations), 1660s, probably of imitative origin (cf. riprap "a sharp blow," 1570s).

Online Etymology Dictionary, © 2010 Douglas Harper
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