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Wiktionary
light water

n. (context chemistry English) water in its standard form of H2O, containing two protium hydrogen atoms, as opposed to heavy water.

Wikipedia
Light water

Light water may refer to:

  • Water, especially
    • water that is not heavy water
    • water used as coolant in a light water reactor
  • Deuterium-depleted water, water that is lighter than normal water

Usage examples of "light water".

In return, the United States would organize an international consortium to build light water reactors that didn’.