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Medical Definition of Deuterium

Deuterium: A non-radioactive isotope of hydrogen that contains a neutron in its nucleus in addition to the one proton normally seen in hydrogen. A deuterium atom is twice as heavy as normal hydrogen.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=26770
Last Editorial Review: 9/14/2016

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