hard water (English) [ IPA: ˈhɑrd ˈwɔtər ASM: হাৰ্ড ৱাটাৰ]
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    Contributed by: Bikram M Baruah on 2008-11-15
    1. (Material Noun-Neuter) Water that has high mineral content (in contrast with soft water). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and sulfates.