reef

Noun
  1. A submerged ridge of rock or coral near the surface of the water (synset 109429671)
    is a type of: ridge - a long narrow natural elevation or striation
    subtypes: coral reef - a reef consisting of coral consolidated into limestone
  2. A rocky region in the southern Transvaal in northeastern South Africa;
    Contains rich gold deposits and coal and manganese (synset 109024251)
    is an instance of: part, region - the extended spatial location of something
    is a part of: transvaal - a province of northeastern South Africa originally inhabited by Africans who spoke Bantu; colonized by the Boers
    same as: rand, witwatersrand
  3. One of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind (synset 103463893)
    is a type of: slip, strip - artifact consisting of a narrow flat piece of material
    is a part of: canvas, canvass, sail, sheet - a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
Verb
  1. Lower and bring partially inboard (synset 201977650)
    "reef the sailboat's mast"
    is a type of: bring down, get down, let down, lower, take down - move something or somebody to a lower position
  2. Roll up (a portion of a sail) in order to reduce its area (synset 200437138)
    is a type of: furl, roll up - form into a cylinder by rolling
  3. Reduce (a sail) by taking in a reef (synset 200242285)
    is a type of: reduce, shrink - reduce in size; reduce physically

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