The Collaborative International Dictionary of English v.0.48:

Electro-negative \E*lec`tro-neg"a*tive\, n. (Chem. & Physics)
   A body which passes to the positive pole in electrolysis; an
   anion.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Electro-negative \E*lec`tro-neg"a*tive\, Electronegative
\E*lec`tro*neg"a*tive\, a. (Chem. & Physics)
   1. Having the property of being attracted by an
      electro-positive body, or a tendency to pass to the
      positive pole in electrolysis, by the law that opposite
      electricities attract each other. Contrasted with
      neutral and electropositive
      [1913 Webster]

   2. Negative; nonmetallic; acidic; -- opposed to positive,
      metallic, or basic.
      [1913 Webster]

   3. (Physics) carrying a negative electrical charge.
      [PJC]

   4. (Chem. and Physics) having a tendency to take up electrons
      and form negative ions; having a relatively positive
      electrode potential.
      [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

electronegative
    adj 1: having a negative charge; "electrons are negative" [syn:
           negative, electronegative, negatively charged]