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univalent

From The Collaborative International Dictionary of English v.0.48:

Univalent \U*niv"a*lent\, a. [Uni- + L. valens, -entis, p. pr.
   See Valence.] (Chem.)
   Having a valence of one; capable of combining with, or of
   being substituted for, one atom of hydrogen; monovalent; --
   said of certain atoms and radicals.
   [1913 Webster]

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