ISOCHROMATIC

\ˌa͡ɪsəkɹə͡ʊmˈatɪk], \ˌa‍ɪsəkɹə‍ʊmˈatɪk], \ˌaɪ_s_ə_k_ɹ_əʊ_m_ˈa_t_ɪ_k]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland