DIADEMATOID
\dˈa͡ɪədɪmˌatɔ͡ɪd], \dˈaɪədɪmˌatɔɪd], \d_ˈaɪ_ə_d_ɪ_m_ˌa_t_ɔɪ_d]\
Definitions of DIADEMATOID
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Of Echinoids, having the pore plates arranged as follows: three primaries with occasionally a secondary between the aboral and the middle primary.
By Henderson, I. F.; Henderson, W. D.
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[Greek] Of Echinoidea, having three primary pore plates with occasionally a secondary between aboral and middle primary; as opp. arbacioid, one primary, with secondary on each side, and triplechinoid, two primaries, with one or more secondaries between.
By J.H. Kenneth