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\hˈɛlpfə͡lnəs], \hˈɛlpfə‍lnəs], \h_ˈɛ_l_p_f_əl_n_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1871 - The Cabinet Dictionary of the English Language