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nuclear reaction Syllabification: nu·cle·ar re·ac·tion

Entry from US English dictionary

Definition of nuclear reaction in English:

noun

Physics A change in the identity or characteristics of an atomic nucleus that results when it is bombarded with an energetic particle, as in fission, fusion, or radioactive decay.

Definition of nuclear reaction in:

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Word of the day fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
adverb
(especially as a direction) very loud or loudly