Heavy-water meaning

Either of two isotopic forms of water, especially deuterium oxide, consisting chiefly of molecules that contain deuterium instead of protium. Heavy water is used as a moderator in certain nuclear reactors.
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Water composed of heavy isotopes of hydrogen or oxygen, or of both; esp., deuterium oxide, D2O, which is water composed of ordinary oxygen and deuterium.
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Water in which deuterium, a heavy isotope of hydrogen, takes the place of hydrogen. Heavy water has physical and chemical properties that are like those of ordinary water, but heavy water is 10 percent heavier and has higher freezing and boiling points. Also called deuterium oxide. Chemical formula: D2O. &diamf3; Semiheavy water is similar to heavy water, but only one of the two hydrogen atoms in each molecule is replaced with deuterium. Chemical formula: DHO.
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(chemistry) Water containing deuterium instead of normal hydrogen (symbol D2O); used as a moderator in nuclear reactors.
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