From The Collaborative International Dictionary of English v.0.48:

Quadrivalent \Quad*riv"a*lent\, a. [Quadri- + L. valens, -entis,
   p. pr. See Valence.] (Chem.)
   Having a valence of four; capable of combining with, being
   replaced by, or compared with, four monad atoms; tetravalent;
   -- said of certain atoms and radicals; thus, carbon and
   silicon are quadrivalent elements.
   [1913 Webster]
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