permanent hardness

noun

chem hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates

Nearby words

  1. permanent cartilage,
  2. permanent court of arbitration,
  3. permanent court of international justice,
  4. permanent dentition,
  5. permanent echo,
  6. permanent health insurance,
  7. permanent magnet,
  8. permanent mold,
  9. permanent press,
  10. permanent resident

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012