- Reef is defined as a ridge of coral, alga, sand or rock close to the surface of the water in the ocean.
An example of a reef is the Great Barrier Reef which was formed when the sea levels rose, flooding the continental shelf of Australia, allowing the coral that were growing on the edges of the shelf to grow and begin form the reef.
- The definition of a reef is part of a boat's sail that can be rolled and tied to cut down on wind resistance.
An example of a reef is the rolled up part of a sail during a storm at sea.
A beautiful coral reef.
reef definition by Webster's New World
- a line or ridge of rock, coral, or sand lying at or near the surface of the water
- Mining a bed or vein of ore; lode
Origin: probably via Dutch or Middle Low German rif ; from Old Norse literally , rib
Origin: Middle English riff ; from or akin to Old Norse rif (; from Indo-European an unverified form reip-, a strip ; from base an unverified form rei-, to tear, cut from source rive): origin, originally used of cords for reefing
- to reduce the size of (a sail) by taking in part of it
- to lower (a spar or mast) or reduce the projection of (a bowsprit)
reef definition by American Heritage Dictionary
- A strip or ridge of rocks, sand, or coral that rises to or near the surface of a body of water.
- A vein of ore.
Origin: Obsolete Dutch rif, possibly from Old Norse, ridge.
- reefˈy adjective
- To reduce the size of (a sail) by tucking in a part and tying it to or rolling it around a yard.
- To shorten (a topmast or bowsprit) by taking part of it in.
Origin: Middle English riff, from Old Norse rif, ridge, reef.
reef - Science Definition