1) Diradical 
Picture taken in France, 2007 with my camera. ...
An even-electron molecular entity with two (possibly delocalized) radical centres which act nearly independently of each other, e.g. Species in which the two radical centres interact significantly are often referred to as 'biradicaloids'. If the two radical centres are located on the same atom, the species are more properly referred to by their gen...
diradical.