toxicity

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.

noun

1. the degree of strength of a poison
2. the state or quality of being poisonous

1881, from toxic + -ity.

n.

1. The quality or condition of being toxic.
2. The degree to which a substance is toxic.