ANTIPROTON

\ˌantɪpɹˈə͡ʊtɒn], \ˌantɪpɹˈə‍ʊtɒn], \ˌa_n_t_ɪ_p_ɹ_ˈəʊ_t_ɒ_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd