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heavy water

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heav·y wa·ter

D₂O; water in which the hydrogen atoms are deuterium, or heavy hydrogen (²H), with physical properties that differ noticeably from those of ordinary water; an elevated presence will cause a decrease in metabolic activity; used as a moderator in nuclear reactors because of its capacity to absorb neutrons.

Synonym(s): deuterium oxide

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deuterium
water

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