Meanings

poison pill (anti-takeover measure)

to be a bad influence (on something)

toxic property

hemolytic-uremic syndrome

verotoxin

botulin

sting (of a bee, etc.)

toxic epidermal necrosis

bacteria capable of causing food poisoning

toxic (poisonous) substance

lonely heart

noxious gas

acute poisoning

one man's meat is another man's poison

my sympathies

the three kleshas that poison the heart of man (desire, ill will and ignorance)

autointoxication

bacterial toxin

nitrogen narcosis

attenuated vaccine