Describes a compound that has a composition such that essentially all the molecules
of the compound have only the indicated
nuclide(s) at each designated position. For all other positions, the absence of
nuclide indication means that the
nuclide composition is the natural one.
Source:
PAC, 1981, 53, 1887
(Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds)
on page 1890