WordReference Random House Unabridged Dictionary of American English © 2026
rip•rap
(rip′rap′),USA pronunciation n., v., -rapped, -rap•ping.
n.
v.t.
n.
- Buildinga quantity of broken stone for foundations, revetments of embankments, etc.
- Buildinga foundation or wall of stones thrown together irregularly.
v.t.
- Buildingto construct with or strengthen by stones, either loose or fastened with mortar.
- gradational reduplication of rap1 1570–80