STRUCTURAL FORMULA

\stɹˈʌkt͡ʃəɹə͡l fˈɔːmjʊlə], \stɹˈʌkt‍ʃəɹə‍l fˈɔːmjʊlə], \s_t_ɹ_ˈʌ_k_tʃ_ə_ɹ_əl f_ˈɔː_m_j_ʊ_l_ə]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe