1. to remove mineral salts or minerals from (a substance, especially water)
Usage: chiefly British spelling; American English typically uses 'demineralize'; commonly used in chemistry and water treatment contexts
2. to deplete or remove minerals from (bone, tissue, or soil)
Usage: medical and geological usage

Examples

• The water treatment plant demineralises tap water to reduce hardness.
• Prolonged acid exposure can demineralise tooth enamel.
• The soil was demineralised by years of heavy rainfall and erosion.
• Distilled water is produced by demineralising ordinary water through reverse osmosis.
• Certain medications may demineralise bones if taken over extended periods.
• The laboratory demineralised the samples before conducting the analysis.