Isotopic - AbsoluteAstronomy.com

The word isotopic has a number of different meanings, including:

In the physical sciences, to do with chemical isotope
Isotope
Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons. Atoms of a particular element by definition must contain the same number of protons but may have a distinct number of neutrons which differs from atom to atom, without changing the designation...

s;
In mathematics, to do with a relation called isotopy.
In geometry, isotopic refers to facet-transitivity.

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