REEF
1 none. 1 ridge of rock or coral etc. At or near the surface of the sea. 2 a lode of ore. B bedrock surrounding this. [old norse rif]
1 none. 1 ridge of rock or coral etc. At or near the surface of the sea. 2 a lode of ore. B bedrock surrounding this. [old norse rif]
2 —none. Each of several strips across a sail, for taking it in or rolling it up to reduce its surface area in a high wind. —verb. Take in a reef or reefs of (a sail). [dutch from old norse]