excimer

[ ek-suh-mer ]
/ ˈɛk sə mər /

noun Chemistry.

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

Origin of excimer

First recorded in 1960–65; exci(ted) + (di)mer

Words nearby excimer

exchangeable, exchangee, exchanger, exchequer, excide, excimer, excipient, exciple, excipulum, excircle, excisable

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