BIVIUM
\bˈɪvi͡əm], \bˈɪviəm], \b_ˈɪ_v_iə_m]\
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One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
By Oddity Software
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One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
By Noah Webster.
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Generally the posterior pair of ambulacral areas in certain Echinoidea; the two rays between which the madreporite lies.
By Henderson, I. F.; Henderson, W. D.