deuterium
n 1: an isotope of hydrogen which has one neutron (as opposed to
zero neutrons in hydrogen) [syn: {deuterium}, {heavy
hydrogen}]
deuterium
Symbol: D
Atomic Weight: 2
A {hydrogen} atom which has but one proton and {neutron}. Deuterium
makes up
about 0.015% of all natural hydrogen. Chemical properties are like that
of
normal {hydrogen}, though somewhat slower.