Definition of "toxicant" [tox•i•cant]

• A poison or poisonous agent. (noun)
• Poisonous; toxic. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "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."
• "Exposure to a metabolite of the environmental toxicant trichloroethylene attenuates CD4+ T cell activation-induced cell death by metalloproteinase-dependent FasL shedding."
• "Ability of environmental toxicant trichloroethylene to promote immune pathology is strain-specific."