the GNU version of the Collaborative International Dictionary of English
n. A poisonous agent or drug, as opium; an intoxicant.
The Century Dictionary and Cyclopedia
Having toxic effect; capable of poisoning.
n. A poison.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any substance that causes injury or illness or death of a living organism
adj. having the qualities or effects of a poison
Word Usage
"But two years ago, California's Development and Reproductive Toxicant Identification Committee of physicians voted unanimously that BPA should not be classified as a dangerous toxicant because there was no evidence of harm to humans."