BIVIUM
Etymology
Noun
bivium (plural bivia)
(zoology) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
Source: Wiktionary
Biv"i*um, n. Etym: [L., a place with two ways. See Bivious.] (Zoöl.)
Definition: One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
Source: Webster’s Unabridged Dictionary 1913 Edition
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