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Definition of Heavy water

Babylon English

water with a higher average molecular weight than ordinary water, water used for cooling the core of an atomic reactor
Heavy water Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
(D2O) Water that contains 2H, rather than 1H. Heavy water is about 11% denser than ordinary water.
NRC Nuclear Energy Glossary
Water containing significantly more than the natural proportions (one in 6,500) of heavy hydrogen (deuterium, D) atoms to ordinary hydrogen atoms. Heavy water is used as a moderator in some reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons.
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).
EIA Energy Glossary
Water containing a significantly greater proportion of heavy hydrogen (deuterium) atoms to ordinary hydrogen atoms than is found in ordinary (light) water. Heavy water is used as a moderator in some reactors because it slows neutrons effectively and also has a low cross section for absorption of neutrons.
Source: Energy Information Administration, 2006
Energy Glossary
A type of hydrogen atom that may be used as fuel for fusion power plants. Also called DEUTERIUM, it is found in abundance in the seas.
Heavy water Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Heavy water (deuterium oxide ( )) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium ( or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope ( or H, also called protium) that makes up most of the hydrogen in regular water.

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Heavy water Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
Water composed of isotopes of hydrogen of atomic weight greater than 1 or of oxygen of atomic weight greater than 16, or both; especially water composed of ordinary oxygen and the isotope of hydrogen of atomic weight 2; Deuterium Oxide (D2O). Typically used as a moderator in certain nuclear reactors. Also see Heavy Water Moderated Reactor.
Heavy water Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. water containing a substantial proportion of deuterium atoms, used in nuclear reactors
(synonym) deuterium oxide
(hypernym) moderator