NUCLEON NUMBER

\njˈuːklɪən nˈʌmbə], \njˈuːklɪən nˈʌmbə], \n_j_ˈuː_k_l_ɪ__ə_n n_ˈʌ_m_b_ə]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd