GERONTOLOGIST

\d͡ʒˌɛɹəntˈɒləd͡ʒˌɪst], \d‍ʒˌɛɹəntˈɒləd‍ʒˌɪst], \dʒ_ˌɛ_ɹ_ə_n_t_ˈɒ_l_ə_dʒ_ˌɪ_s_t]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd