Definitions for "Riprap"
A foundation or sustaining wall of stones thrown together without order, as in deep water or on a soft bottom, or in a river channel.
Large slabs of stone used as a protective barrier at the edge of a body of water.
Large fragments of broken rock, thrown together irregularly or fitted together (as on the down-stream face of a dam). Its purpose is to prevent erosion by waves or currents and thereby preserve a surface, slope, or underlying structure. It is used for irrigation channels, river-improvement works, spillways at dams, and sea walls for shore protection.
Keywords:  form
To form a riprap in or upon.