|1.||a ridge of rock, sand, coral, etc, the top of which lies close to the surface of the sea|
|2.||a ridge- or mound-like structure built by sedentary calcareous organisms (esp corals) and consisting mainly of their remains|
|3.||a vein of ore, esp one of gold-bearing quartz|
|[C16: from Middle Dutch ref, from Old Norse rif|
reefing reef·ing (rē'fĭng)
Surgical reduction of the extent of a tissue by folding it and securing with sutures.