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A poison or poisonous agent.
Poisonous; toxic.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. a toxic substance; poison
2. a rare word for intoxicant
poisonous; toxic
[C19: from Medieval Latin toxicāre to poison; see toxic]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtɒk sɪ kənt)

1. poisonous; toxic.
2. a poison.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.toxicant - any substance that causes injury or illness or death of a living organismtoxicant - any substance that causes injury or illness or death of a living organism
substance - a particular kind or species of matter with uniform properties; "shigella is one of the most toxic substances known to man"
atropine - a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides
hyoscyamine - a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract
toxin - a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species
Adj.1.toxicant - having the qualities or effects of a poisontoxicant - having the qualities or effects of a poison
toxic - of or relating to or caused by a toxin or poison; "suffering from exposure to toxic substances"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


Capable of injuring or killing by poison:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
This toxicant gained notoriety as a defoliant used by U.S.
The NIH also expects to invest in and develop four new environmental monitoring tests and devices each year to measure toxicant exposures, dietary intake, and physical activity, and to determine individuals' biological responses to those influences.
While polyurethane floor finishes don't emit the toxicant, he found, the more durable acid-cured resin finishes do.
Second, a team of physician scientists, research scientists trained in the basic biomedical disciplines, and public health researchers will work collaboratively to use toxicant exposures or environmental perturbations to understand human disease.
Until recently, TCDD was considered the most potent dioxinlike toxicant.
And there were hundreds of reported oil and toxicant spills--including gas that may have seeped from an estimated 350,000 swamped cars--as well as drowned industrial and toxic waste dumps.
Little's worst-case analyses indicate that people showering for 10 minutes in water containing this VOC would inhale 50 percent more of the potential toxicant than they would ingest by drinking two liters of that water.
Fourth are interdisciplinary approaches to the development of intervention and prevention strategies to alter the progression of environmentally induced human disease: 1) identification of novel compounds or engineering of biocompatible materials that protect against, inhibit, or reverse toxicant actions and their validation in disease relevant settings; 2) development of mechanistically derived prevention strategies and application of them in populations with known genetic susceptibility to environmental stressors.
It now appears that the developing male reproductive system is more sensitive to the effects of this hormone-like toxicant than any other organ or organ system studied, the Wisconsin scientists write.
Brian A Primack, M.D., Ph.D., from the University of Pittsburgh, and colleagues compared toxicant load from waterpipe tobacco smoking and cigarette tobacco smoking among 3,254 young adults.
Specifically PD patients have greater percentage of B, C, and D categories (PD: none = 45.67%, toxicant exposure 34.67%, positive family history 10.33%, and "double hit" 9.33%; controls: none = 64.3%, toxicant exposure 29.7%, positive family history 3%, and "double hit" 3%; p < 0.00001).
In mice fed a high-fat diet, the team found no connection between PCB-77 exposure and effects like those seen in the low-fat group, despite the animals' having double the concentration of the toxicant in fat tissue.