ECHINOID

\ˈɛt͡ʃɪnˌɔ͡ɪd], \ˈɛt‍ʃɪnˌɔ‍ɪd], \ˈɛ_tʃ_ɪ_n_ˌɔɪ_d]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.