The Collaborative International Dictionary of English v.0.48:

Venom \Ven"om\, n. [OE. venim, OF. venim, venin, F. venin, L.
   venenum. Cf. Venenate.]
   1. Matter fatal or injurious to life; poison; particularly,
      the poisonous matter which certain animals, such as
      serpents, scorpions, bees, etc., secrete in a state of
      health, and communicate by biting or stinging.
      [1913 Webster]

            Or hurtful worm with cankered venom bites. --Milton.
      [1913 Webster]

   2. Spite; malice; malignity; evil quality. --Chaucer. "The
      venom of such looks." --Shak.
      [1913 Webster]

   Syn: Venom; virus; bane. See Poison.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Venom \Ven"om\, v. t. [OE. venimen, OF. venimer, L. venenare.
   See Venom, n.]
   To infect with venom; to envenom; to poison. [R.] "Venomed
   vengeance." --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

venom
    n 1: toxin secreted by animals; secreted by certain snakes and
         poisonous insects (e.g., spiders and scorpions)
    2: feeling a need to see others suffer [syn: malice,
       maliciousness, spite, spitefulness, venom]

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "venom":
   abomination, acaricide, acrimony, acuteness, animality, animosity,
   animus, antagonism, anthelmintic, antibiotic, antiseptic, atrocity,
   bad, bad blood, bane, barbarity, befoulment, bitter feeling,
   bitterness, blight, bloodlust, brutality, bug bomb,
   carbamate insecticide, chemosterilant,
   chlorinated hydrocarbon insecticide, communicability,
   contact poison, contagion, contagiousness, corruption, crying evil,
   damage, deadliness, defilement, defoliant, despoliation,
   destruction, destructiveness, detriment, disinfectant, eradicant,
   evil, extremity, ferociousness, feud, fierceness, force, fumigant,
   fungicide, furiousness, gall, germicide, grievance, hard feelings,
   harm, harshness, hate, hatred, havoc, herbicide, hostility, hurt,
   ill, ill blood, ill feeling, ill will, impetuosity, inclemency,
   infection, infectiousness, infectivity, inhumanity, injury,
   insect powder, insecticide, intensity, malevolence, malice,
   maliciousness, malignancy, malignity, mercilessness, microbicide,
   mindlessness, mischief, miticide, murderousness, noxiousness,
   organic chlorine, organic phosphate insecticide, outrage,
   pesticide, pitilessness, poison, poisonousness, pollution, rancor,
   rat poison, rigor, roach paste, roach powder, rodenticide,
   roughness, savagery, severity, sharpness, soreness, sourness,
   spite, spitefulness, spleen, stomach poison, systemic,
   systemic insecticide, terrorism, the worst, toxic, toxicant,
   toxicity, toxin, ungentleness, vandalism, vehemence, vendetta,
   venin, venomousness, vermicide, vexation, viciousness, violence,
   virulence, virulency, virus, vitriol, weed killer, woe, wrong