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.-that which taints or destroys moral purity or health; as, the poison of evil example; the poison of sin.-to put poison upon or into; to infect with poison; as, to poison an arrow; to poison food or drink.-to injure or kill by poison; to administer poison to.-to taint; to corrupt; to vitiate; as, vice poisons happiness; slander poisoned his mind.-to act as, or convey, a poison.