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.

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

One who poises or balances something. / The balancer of dipterous insects.

A state of balance, equilibrium or stability. / Composure; freedom from embarrassment or affectation. / Mien; bearing or deportment of the head or body. / A condition of hovering, or being suspended.

(obsolete) To hang in equilibrium; to be balanced or suspended; hence, to be in suspense or doubt. / (obsolete) To counterpoise; to counterbalance. / (obsolete) To be of a given weight; to weigh.

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

present participle of poison

(mathematics) The Poisson distribution.

(pathology) A chronic intoxication produced by the absorption of lead into the body, characterized by severe colicky pains, a dark line along the gums, and local muscular paralysis.