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  1. Dictionary
    reef
    /riːf/

    noun

    • 1. each of the several strips across a sail which can be taken in or rolled up to reduce the area exposed to the wind.

    verb

    • 1. take in one or more reefs of (a sail): "reef the mainsail in strong winds"

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    More definitions, origin and scrabble points

  2. dictionary.cambridge.org › dictionary › englishREEF | English meaning - Cambridge Dictionary

    A reef is a line of rocks or sand under the sea, often dangerous to ships. Learn more about different types of reefs, such as coral reefs, and see examples of reef in sentences.

  3. en.wikipedia.org › wiki › ReefReef - Wikipedia

    A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. [1] . Many reefs result from natural, abiotic (non-living) processes such as deposition of sand or wave erosion planing down rock outcrops.

  4. www.nationalgeographic.org › encyclopedia › reefReef - National Geographic Society

    Oct 19, 2023 · A reef is a ridge of material at or near the surface of the ocean. Reefs can occur naturally. Natural reefs are made of rocks or the skeletons of small animals called corals. Reefs can also be artificial—created by human beings. Artificial Reefs. People create reefs for three chief reasons. The first is to protect the coastline.

  5. www.dictionary.com › browse › reefREEF Definition & Meaning | Dictionary.com

    Reef definition: a ridge of rocks or sand, often of coral debris, at or near the surface of the water.. See examples of REEF used in a sentence.

  6. www.merriam-webster.com › dictionary › reefReef Definition & Meaning - Merriam-Webster

    verb. reefed; reefing; reefs. transitive verb. 1. : to reduce the area of (a sail) by rolling or folding a portion. 2. : to lower or bring inboard (a spar) wholly or partially. intransitive verb. : to reduce a sail by taking in a reef. reefable. ˈrē-fə-bəl. adjective. reef. 3 of 3. noun (2)

  7. www.collinsdictionary.com › dictionary › englishREEF definition and meaning | Collins English Dictionary

    A reef is a long line of rocks or sand, the top of which is just above or just below the surface of the sea. It can also be a ridge of coral, a vein of ore, or a part of a sail that is rolled and tied down.

  8. www.britannica.com › dictionary › reefReef Definition & Meaning | Britannica Dictionary

    Learn the meaning of reef as a noun, with examples of different types of reefs in the ocean. Find out the difference between barrier reef, coral reef and Great Barrier Reef.