What does the word reef mean?

Usage examples for reef

  1. If it were a reef of gold it would be of no value to us. – The Squire's Daughter by Silas K(itto) Hocking
  2. When it approached the outer reef, its awful magnitude became more evident. – The Ocean and its Wonders by R.M. Ballantyne
  3. On the 23rd a Manono boat of the kind called taumualua dropped down the coast from Mataafa's camp, called in broad day at the German quarter of the town for guides, and proceeded to the reef. – The Works of Robert Louis Stevenson - Swanston Edition Vol. 17 (of 25) by Robert Louis Stevenson Other: Andrew Lang