[foh-toh-noo-klee-er, -nyoo- or, by metathesis, -kyuh-ler]
of, relating to, or caused by the collision of high-energy photons with the nucleus of an atom.
Origin of photonuclear
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
physics of or concerned with a nuclear reaction caused by a photon
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