noun, plural tox·ic·i·ties.
  1. 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. 2018

British Dictionary definitions for non-toxicity


  1. the degree of strength of a poison
  2. 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 non-toxicity


1881, from toxic + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper

non-toxicity in Medicine


  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.