deuterium(redirected from H 2)
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the mass 2 isotope of hydrogen; it is available as a gas or heavy water and has been used as a tracer or indicator in metabolic studies.
deuterium/deu·te·ri·um/ (D) (doo-tēr´e-um) see hydrogen.
Etymology: Gk, deuteros, second
hy·dro·gen 2(2H) (hī'drō-jen)
The isotope of hydrogen 2 of atomic weight 2; the less common stable isotope of hydrogen-2 making up 0.015% of the hydrogen-2 atoms occurring in nature.
1. Gaseous element, atomic no. 1, atomic wt. 1.00794.
2. Molecular form (H2) of the element.
[hydro- + G. -gen, producing]
the mass 2 isotope of hydrogen, symbol 2H or D; it is available as a gas or heavy water and is used as a tracer or indicator in studying metabolism.