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

heavy water

water in which the hydrogen component is deuterium (2H), or heavy hydrogen. It has properties different from those of ordinary water. Because of its ability to absorb neutrons, heavy water is used as a moderator in nuclear reactions. Also written as D2O.

heavy water

D2O; an isotopic variety of water, esp. deuterium oxide, in which hydrogen has been displaced by its isotope, deuterium. Its properties differ from ordinary water in that heavy water has a higher freezing and boiling point and does not support life.
See also: water
References in periodicals archive ?
Legislator Ephraim Sneh of the Labor Party warned that the heavy-water plant marks "another leap in Iran's advance toward a nuclear bomb".
The ceremony on Saturday at the Khondab heavy-water plant, which has been operating since 2004, was largely a symbolic gesture underlining Iran's determination to ignore international pressure.
During the process the Arak heavy-water reactor will be reconfigured so it cannot yield fissile plutonium usable in a nuclear bomb.
The Islamic Republic has said that the 40-megawattAaAeAeA heavy-water pla is aimed at producing isotopes for cancer and other medical treatments, and has denied that any of its nuclear activity is geared toward developing weapons.
A heavy-water reactor can produce weapons-grade plutonium more easily than a light-water type.
AP quoted Manouchehr Madadi, top official of the heavy-water plant, as saying the facility now has the ability to produce up to 16 tons of heavy water a year.
It is also expected to ask Iran for explanations, such as the purpose of the facility, since whether the country needs a heavy-water reactor is unclear, the sources said.
According to the sources and IAEA officials, the program was designed to build a 40-megawatt-level heavy-water reactor in Arak, some 230 kilometers southwest of Tehran.
China is building a second heavy-water reactor at the Taishan nuclear plant.
If results from control runs differed significantly from those of the heavy-water experiments, the case for anew route to fusion would be greatly strengthened, says Harold furth, head of the Princeton (N.
China on Tuesday activated its first commercial heavy-water reactor in the eastern province of Zhejiang, China's Central Television said.