D defs.my
Entry 1 sense Webster, 1913

Quadrivalent

· Quad·riv·a·lent · IPA /kwɒdrɪˈveɪlənt/
01 a. Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; -- said of certain…
  1. 1.
    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.(Chem.)