[foh-toh-noo-klee-er, -nyoo- or, by metathesis, -kyuh-ler]
adjective Physics.
of, pertaining to, or caused by the collision of high-energy photons with the nucleus of an atom.

1940–45; photo- + nuclear

See nuclear. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photonuclear (ˌfəʊtəʊˈnjuːklɪə)
physics of or concerned with a nuclear reaction caused by a photon

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Gammas could theoretically handle photonuclear once data becomes available.
At electron accelerators, neutrons are generated via photonuclear reactions from bremsstrahlung photons.
Photonuclear capability is included in this release.
Improvements in photonuclear cross sections and yields.
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