Definition of poison

• n. - Any agent which, when introduced into the animal organism, is capable of producing a morbid, noxious, or deadly effect upon it; as, morphine is a deadly poison; the poison of pestilential diseases.
• n. - That which taints or destroys moral purity or health; as, the poison of evil example; the poison of sin.
• n. - To put poison upon or into; to infect with poison; as, to poison an arrow; to poison food or drink.
• n. - To injure or kill by poison; to administer poison to.
• n. - To taint; to corrupt; to vitiate; as, vice poisons happiness; slander poisoned his mind.
• v. i. - To act as, or convey, a poison.