Tending to contaminate.

1. Having the qualities or effects of a poison; SYN. toxicant.
2. Marked by deep ill will; deliberately harmful SYN. venomous, vicious.
3. Not safe to eat.

ETYM Latin toxicum poison, originally, a poison in which arrows were dipped, Greek toxikon poison for smearing arrows with, from toxikos of or for the bow, from toxon bow, arrow. Related to Intoxicate.
Of or relating to or caused by a toxin or poison.
Poisoning; pertaining to or due to poison.

ETYM Old Eng. venemous, venimous, French venimeux, Latin venenosus, from venenum poison. Related to Venom, Venenose.
1. Full of venom; noxious to animal life; poisonous.
2. Having a poison gland or glands for the secretion of venom, as certain serpents and insects.
3. Noxious; mischievous; malignant; spiteful.

ETYM Latin venosus, from vena a vein. Related to Vein.
Of or contained in or performing the function of the veins.
Of or relating to veins.
Pertaining to the veins; applied to blood carried by veins to heart, containing impurities.

1. Viperine
2. Having the qualities attributed to a viper; malignant, venomous

ETYM Latin virulentus, from virus poison: cf. French virulent. Related to Virus.
Infectious; having the ability to cause disease.

In a very malevolent manner; SYN. venomously.

Poisonously

In a virulent manner.