1. 
   Bivium
   Biv'i·um noun [ Latin , a place with two ways. See Bivious .] (Zoology) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side ( trivium ), which includes three ambulacra.
   Found op http://www.encyclo.co.uk/webster/B/59
   
   
2. 
   bivium
   <zoology> One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra. ... Origin: L, a place with two ways. See Bivious. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?bivium
   
   
3. 
   Bivium
   • (n.) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
   Found op http://thinkexist.com/dictionary/meaning/bivium/
   
   

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