deuterium

Noun

1. (chemistry)a type of Hydrogen atoms that they nuclear has one proton and one neutron.It can write as ${\displaystyle {\ce {^{2}_{1}H}}}$ or ${\displaystyle {\ce {^{2}H}}}$ or ${\displaystyle {\ce {D}}}$.
2. (chemistry)Substance consisted by deuterium atoms.