Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “toxic”

toxic

adjective
 
 
/ˈtɒksɪk/
B2 poisonous: toxic chemicals/fumes toxic waste (= poisonous waste materials produced by industry) Poisoning and allergy
toxicity
 
 
/tɒkˈsɪsəti/ noun [U] formal
how poisonous a substance isPoisoning and allergy
(Definition of toxic from the Cambridge Learners Dictionary © Cambridge University Press)
Browse related topics

You are looking at an entry to do with Difficult situations and unpleasant experiences, but you might be interested in these topics from the Easy and difficult topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “toxic” in other dictionaries

Word of the Day

flair

natural ability to do something well

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More