ECHINENONE
\ˈɛt͡ʃa͡ɪnnˌɒn], \ˈɛtʃaɪnnˌɒn], \ˈɛ_tʃ_aɪ_n_n_ˌɒ_n]\
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[Greek] A carotenoid pigment of sea-urchin gonads, a provitamin A.
By J.H. Kenneth
