v. t. [ F. rogner, OF. rooignier, to clip, pare, scare, fr. L. rotundus round See Rotund. ] To bite; to gnaw. [ Written also roin. ] [ Obs. ] Spenser. [ 1913 Webster ]
(n) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away, Syn. bulwark, seawall, mole, groyne, groin, jetty