REEF

I. noun see: rive Date: 14th century a part of a sail taken in or let out in regulating size, reduction in sail area by ~ing, II. verb Date: 1667 transitive verb to reduce the area of (a sail) by rolling or folding a portion, to lower or bring inboard (a spar) wholly or partially, intransitive verb to reduce a sail by taking in a ~, ~able adjective III. noun see: rib Date: 1584 1. a chain of rocks or coral or a ridge of sand at or near the surface of water, a hazardous obstruction, lode , vein , ~y adjective