{i} molecule formed from the combination of two identical smaller molecules (Chemistry)
A molecule which consists of two similar (but not necessarily identical) subunits The term could also be used as a verb referring to the act of the two subunits coming together (to dimerize) 09 Oct 1997 [OMD]
(Kimya) An excimer (originally short for excited dimer) is a short-lived dimeric or heterodimeric molecule formed from two species, at least one of which is in an electronic excited state. Excimers are often diatomic and are formed between two atoms or molecules that would not bond if both were in the ground state. The lifetime of an excimer is very short, on the order of nanoseconds