Diradical

A diradical in organic chemistry is a molecular species with two electrons occupying two degenerate molecular orbitals (MO). They are known by their higher reactivities and shorter lifetimes. In a broader definition diradicals are even-electron molecules that have one fewer bond than the number permitted by the standard rules of valence. If the el...
Found on http://en.wikipedia.org/wiki/Diradical

diradical

See biradical.
Found on http://www.chem.qmul.ac.uk/iupac/gtpoc/D.html
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