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[tok-sis-i-tee] /tɒkˈsɪs ɪ ti/
noun, plural toxicities.
the quality, relative degree, or specific degree of being toxic or poisonous:
to determine the toxicity of arsenic.
Origin of toxicity
First recorded in 1880-85; toxic + -ity
Related forms
hypertoxicity, noun
nontoxicity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for toxicity
Contemporary Examples
Historical Examples
  • Intramuscularly the toxicity is 30 percent greater than subcutaneously.

    All About Coffee William H. Ukers
  • Aubert6 studied the toxicity of caffein in man and other animals.

    The Toxicity of Caffein William Salant
  • This diet does not seem to be a factor, therefore, in the toxicity of caffein.

    The Toxicity of Caffein William Salant
  • The toxicity of caffein was studied in a large number of individuals.

    The Toxicity of Caffein William Salant
  • Diet was without any influence on the toxicity of the single dose of caffein.

    The Toxicity of Caffein William Salant
British Dictionary definitions for toxicity


the degree of strength of a poison
the state or quality of being poisonous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for toxicity

1881, from toxic + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper
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toxicity in Medicine

toxicity tox·ic·i·ty (tŏk-sĭs'ĭ-tē)

  1. The quality or condition of being toxic.

  2. The degree to which a substance is toxic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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