BIVIUM

Bivium

Biv"i*um\, n. [L., a place with two ways. See Bivious.] (Zo["o]l.) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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