Containing sufficient poison to be dangerous to touch or ingest. / (figuratively) Negative, harmful.

In a poisonous manner. / (obsolete) Using poison.

The state or quality of being poisonous.

A substance that is harmful or lethal to a living organism when ingested. / Something that harms a person or thing.

(transitive) To use poison to kill or paralyse (somebody). / (transitive) To pollute; to cause to become poisonous. / (transitive) To cause to become much worse.

The administration of a poison. / The state of being poisoned.

present participle of poison

(of a living thing) Killed, paralysed, or harmed by receiving a dose of poison. / Containing poison; poisonous. / (figuratively) Having a strongly negative effect; harmful.

simple past tense and past participle of poison

A person who poisons something or someone.