METHANE SERIES

\mˈiːθe͡ɪn sˈi͡əɹiz], \mˈiːθe‍ɪn sˈi‍əɹiz], \m_ˈiː_θ_eɪ_n s_ˈiə_ɹ_i_z]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd