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reef

 
Noun reef has 2 senses
  1. reef - a submerged ridge of rock or coral near the surface of the water
    --1 is a kind of
    ridge
    --1 has particulars: coral reef
  2. Witwatersrand, Rand, Reef - a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese
    --2 is a kind of region, part
    --2 is a part of Transvaal
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