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Wiktionary
demineralize

vb. To remove minerals or mineral salts from (a liquid).

WordNet
demineralize

v. remove the minerals or salts from; "demineralize water" [syn: demineralise]

Usage examples of "demineralize".

Over the nine-plus months of their flight from Earth their spacecraft had spun on a five-kilometer-long tether to simulate a feeling of weight, since prolonged periods in zero gravity weakened muscles dangerously and demineralized bones.