bivium definition

  • noun:
    • One side of an echinoderm, including a pair of ambulacra, in distinction from contrary side (trivium), including three ambulacra.
    • One side of an echinoderm, including a set of ambulacra, in difference from reverse side (trivium), including three ambulacra.
    • In echinoderms, the ambulacra of this two posterior arms or rays taken together and distinguished from the three anterior rays collectively. See trivium, and cut under Spatangoida.

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  • Sentence for "bivium"
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