RECONNOITER OR -TRE

\ɹˌiːkənˈɔ͡ɪtəɹ ɔː tɹˈiː], \ɹˌiːkənˈɔ‍ɪtəɹ ɔː tɹˈiː], \ɹ_ˌiː_k_ə_n_ˈɔɪ_t_ə_ɹ ɔː t_ɹ_ˈiː]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald