ENDOSKELETON

\ˈɛndə͡ʊskˌɛlɪtən], \ˈɛndə‍ʊskˌɛlɪtən], \ˈɛ_n_d_əʊ_s_k_ˌɛ_l_ɪ_t_ə_n]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland