Real Dictionary

venom
uncountable noun: You can use venom to refer to someone's feelings of great bitterness and anger towards someone.
variable noun: The venom of a creature such as a snake or spider is the poison that it puts into your body when it bites or stings you.

venom in American English
the poison secreted by some snakes, spiders, insects, etc., introduced into the body of the victim by bite or sting
noun: the poisonous fluid that some animals, as certain snakes and spiders, secrete and introduce into the bodies of their victims by biting, stinging, etc
transitive verb: to make venomous; envenom

venom in British English
noun: a poisonous fluid secreted by such animals as certain snakes and scorpions and usually transmitted by a bite or sting