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excimer

[ ek-suh-mer ]
/ ˈɛk sə mər /
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noun Chemistry.

a molecular complex of two, usually identical, molecules that is stable only when one of them is in an excited state.

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Origin of excimer

First recorded in 1960–65; exci(ted) + (di)mer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for excimer

excimer
/ (ˈɛkˌsaɪmə) /

noun

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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