of, pertaining to, affected with, or caused by a toxin or poison: a toxic condition.
acting as or having the effect of a poison; poisonous: a toxic drug.
pertaining to or noting debt that will probably not be repaid: toxic mortgages.
pertaining to or noting a financial instrument or other asset that has no value or an unknown value because there is no market for it: toxic mortgage-backed securities.
a toxic chemical or other substance.

1655–65; < Late Latin toxicus poisonous, adj. derivative of Latin toxicum poison < Greek toxikón (orig. short for toxikòn phármakon literally, bow poison, i.e., poison used on arrows), equivalent to tóx(on) bow + -ikon, neuter of -ikos -ic

toxically, adverb
hypertoxic, adjective
nontoxic, adjective
nontoxically, adverb
posttoxic, adjective
untoxic, adjective
untoxically, adverb

toxic, toxin. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nontoxic (nɒnˈtɒksɪk)
not of, relating to, or caused by a toxin or poison: safe, nontoxic paint

toxic (ˈtɒksɪk)
1.  of, relating to, or caused by a toxin or poison; poisonous
2.  harmful or deadly
3.  (of a financial asset) likely to cause significant loss to the holder
[C17: from medical Latin toxicus, from Latin toxicum poison, from Greek toxikon (pharmakon) (poison) used on arrows, from toxon arrow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1664, from Fr. toxique, from L.L. toxicus "poisoned," from L. toxicum "poison," from Gk. toxikon (pharmakon) "(poison) for use on arrows," from toxikon, neut. of toxikos "pertaining to arrows or archery," and thus to a bow, from toxon "bow," probably from a Scythain word that also was borrowed into L.
as taxus "yew."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

toxic tox·ic (tŏk'sĭk)

  1. Of, relating to, or caused by a toxin or other poison.

  2. Capable of causing injury or death, especially by chemical means; poisonous.

A toxic chemical or other substance.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
toxic   (tŏk'sĭk)  Pronunciation Key 
  1. Relating to or caused by a toxin.

  2. Capable of causing injury or death, especially by chemical means; poisonous.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Since nothing but leaves and water are added, they're nontoxic and can be
  safely added to the compost pile.
Minimize fertilizer and pesticide use on your lawn and garden or switch to
  organic, nontoxic alternatives.
The animal gnawed and chewed the tree's bark but avoided the nontoxic leaves
  and fruit.
That's the soundest effective and nontoxic way to stop the spread of pests.
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