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[foh-toh-noo-klee-er, -nyoo- or, by metathesis, -kyuh-ler] /ˌfoʊ toʊˈnu kli ər, -ˈnyu- or, by metathesis, -kyə lər/

adjective, Physics.
of, relating to, or caused by the collision of high-energy photons with the nucleus of an atom.
(physics) of or concerned with a nuclear reaction caused by a photon


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