METHYLENE GROUP

\mˈɛθɪlˌiːn ɡɹˈuːp], \mˈɛθɪlˌiːn ɡɹˈuːp], \m_ˈɛ_θ_ɪ_l_ˌiː_n ɡ_ɹ_ˈuː_p]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd