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]
Negative; nonmetallic; acidic; -- opposed to positive, metallic, or basic. [1913 Webster]
carrying a negative electrical charge. [PJC]
having a tendency to take up electrons and form negative ions; having a relatively positive electrode potential. [WordNet 1.5]