TRIGONOMETRICAL

\tɹˌɪɡənə͡ʊmˈɛtɹɪkə͡l], \tɹˌɪɡənə‍ʊmˈɛtɹɪkə‍l], \t_ɹ_ˌɪ_ɡ_ə_n_əʊ_m_ˈɛ_t_ɹ_ɪ_k_əl]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald