Relating to a nucleus, either cellular or atomic; in the latter sense, usually referring to radiation emanating from atomic nuclei (α, β, or γ) or to atomic fission.
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1) of, relating to, or constituting a nucleus
2) of, relating to, or utilizing the atomic nucleus, atomic energy, the atomic bomb, or atomic power
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nu·cle·ar (nooґkle-ər) pertaining to a nucleus.Medical dictionary. 2011.