ECTOSOME
\ˈɛktə͡ʊsˌə͡ʊm], \ˈɛktəʊsˌəʊm], \ˈɛ_k_t_əʊ_s_ˌəʊ_m]\
Definitions of ECTOSOME
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The enveloping portion of a Sponge containing no flagellated chambers.
By Henderson, I. F.; Henderson, W. D.