1. A loose foundation of stones in deep water on a soft bottom.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• raptrap,
• eiprap,
• diprap,
• fiprap,
• tiprap,
• 5iprap,
• 4iprap,
• ruprap,
• rjprap,
• rkprap,
• roprap,
• r9prap,
• ripprap,
• riprappe,
• Repprap,
• Ripraps,
• Riprapa,
• Ripprape,
• Raprapa,
• Reprap

The plural of the "Riprap" can be the "ripraps".

The singular of the "Riprap" can be the "Riprap".