n. Aridity; dryness. [ 1913 Webster ]
n. [ AS. heardness. ]
The habit of authority also had given his manners some peremptory hardness. Sir W. Scott. [ 1913 Webster ]
☞ This quality is caused by the presence of calcium carbonate, causing temporary hardness which can be removed by boiling, or by calcium sulphate, causing permanent hardness which can not be so removed, but may be improved by the addition of sodium carbonate. [ 1913 Webster ]
n. [ AS. heardness. ]
The habit of authority also had given his manners some peremptory hardness. Sir W. Scott. [ 1913 Webster ]
☞ This quality is caused by the presence of calcium carbonate, causing temporary hardness which can be removed by boiling, or by calcium sulphate, causing permanent hardness which can not be so removed, but may be improved by the addition of sodium carbonate. [ 1913 Webster ]