riprap

Etymology
Apparently a reduplication (with vowel dissimilation) of.

Noun

 * 1) An underwater bank seen as a danger to shipping.
 * 2)  Rocks or other materials used to shore up an embankment, deter or prevent erosion, guide shipping, or serve as a temporary mooring.
 * 1)  Rocks or other materials used to shore up an embankment, deter or prevent erosion, guide shipping, or serve as a temporary mooring.

Verb

 * 1) To form a riprap in or upon.

Etymology
From.

Noun

 * 1) a  rocks or other materials used to shore up an embankment, deter or prevent erosion, guide shipping, or serve as a temporary mooring

Verb

 * 1) to