2) deuterium. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of 2.014. deuter(o)- + -ium....

3) deuterium oxide. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...An isotopic form of water with composition D2O, isolated for use as a moderator in certain nuclear reactors....

4) hydrogen. The Columbia Encyclopedia, Sixth Edition. 2001
...1.007822); the protium nucleus (protium ion) is a proton. A second isotope of hydrogen is deuterium (mass no. 2, atomic mass 2.0140), the so-called heavy hydrogen,...

5) cold fusion. The Columbia Encyclopedia, Sixth Edition. 2001
...cold fusion, or low-temperature fusion, nuclear fusion of deuterium, an isotope of hydrogen, at or relatively near room temperature. Fusion, the reaction involved...

6) heavy water. The Columbia Encyclopedia, Sixth Edition. 2001
...heavy water, see deuterium....

7) D 1. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...1. The symbol for the isotope deuterium. 2. also d The symbol for the Roman numeral 500....

8) deuteron. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...abbr. d The nucleus of a deuterium atom, consisting of a proton and a neutron, regarded as a subatomic particle with unit positive charge. deuter(ium) + -on1....

9) heavy hydrogen. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...An isotope of hydrogen with mass number greater than 1; deuterium or tritium....

10) heavy water. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...Any of several isotopic forms of water, especially deuterium oxide, that consists chiefly of molecules containing heavy hydrogen and is used as a moderator in certain...