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excimer

[ek-suh-mer] /ˈɛk sə mər/
noun, Chemistry.
1.
a molecular complex of two, usually identical, molecules that is stable only when one of them is in an excited state.
Origin of excimer
1960-1965
First recorded in 1960-65; exci(ted) + (di)mer
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for excimer

excimer

/ˈɛkˌsaɪmə/
noun
1.
(physics) an excited dimer formed by the association of excited and unexcited molecules, which would remain dissociated in the ground state
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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