from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A loose assemblage of broken stones erected in water or on soft ground as a foundation.
- n. The broken stones used for such a foundation.
- transitive v. To construct a riprap in or on.
- transitive v. To strengthen with a riprap.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Rocks or other materials used to shore up an embankment, deter or prevent erosion, guide shipping, or serve as a temporary mooring.
- v. To form a riprap in or upon.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
- transitive v. To form a riprap in or upon.
from The Century Dictionary and Cyclopedia
- n. In engineering: Broken stones used for walls, beds, and foundations: sometimes used attributively.
- n. A foundation or parapet of stones thrown together without any attempt at regular structural arrangement, as in deep water or on a soft bottom.
Reduplication of rap1.(American Heritage® Dictionary of the English Language, Fourth Edition)