The Collaborative International Dictionary of English v.0.48:

Invective \In*vec"tive\, a. [L. invectivus: cf. F. invectif. See
   Inveigh.]
   Characterized by invection; critical; denunciatory;
   satirical; abusive; railing.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Invective \In*vec"tive\, n. [F. invective.]
   An expression which inveighs or rails against a person; a
   severe or violent censure or reproach; something uttered or
   written, intended to cast opprobrium, censure, or reproach on
   another; a harsh or reproachful accusation; -- followed by
   against, having reference to the person or thing affected;
   as, an invective against tyranny.
   [1913 Webster]

         The world will be able to judge of his [Junius']
         motives for writing such famous invectives. --Sir W.
                                                  Draper.

   Syn: Abuse; censure; reproach; satire; sarcasm; railing;
        diatribe. See Abuse.
        [1913 Webster]

WordNet (r) 3.0 (2006):

invective
    n 1: abusive or venomous language used to express blame or
         censure or bitter deep-seated ill will [syn:
         vituperation, invective, vitriol]