rip-rap or riprap /ripˈrap/

1. Loose broken stones, used to form a foundation on soft ground or under water, or in the construction of revetments and embankments
2. A foundation formed of these

• selenate
• selenates
• selenian
• selenic
• selenic acid
• selenide
• selenides
• selenious
• selenious acid
• selenite
• selenites
• selenitic
• selenium
• selenium cell
• selenium cells
• seleniums
• selenodont
• selenodonts
• selenograph
• selenographer
• selenographers
• selenographic
• selenographical
• selenographies
• selenographs