noun, plural tox·ic·i·ties.

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 formshy·per·tox·ic·i·ty, nounnon·tox·ic·i·ty, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for toxicity

Contemporary Examples of toxicity

Historical Examples of toxicity

  • 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.

  • This diet does not seem to be a factor, therefore, in the toxicity of caffein.

  • The toxicity of caffein was studied in a large number of individuals.

  • Diet was without any influence on the toxicity of the single dose of caffein.

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

Word Origin and History for toxicity

1881, from toxic + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for toxicity




The quality or condition of being toxic.
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.