Reef (noun)

  1. A line of rocks or coral extending above or below the surface of the sea.
  2. An underwater ridge or formation of coral or rock.
  3. A barrier or obstruction to navigation.
  4. A strip of material sewn across the width of a sail to reduce its area and keep it from becoming full of wind.

Origin:

From old english rif, from proto-germanic *ribjaz.

Examples:

  1. The ship ran aground on a reef.
  2. The coral reef is home to a diverse ecosystem.
  3. The reef is a popular spot for diving and snorkeling.
  4. The reef was a danger to ships sailing in the area.
  5. The reef was used to reduce the sail area.
Some random words: equation, inauspicious, decompose