• synonyms


noun Chemistry.
  1. 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. 2018

British Dictionary definitions for excimer


  1. physics an excited dimer formed by the association of excited and unexcited molecules, which would remain dissociated in the ground state
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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