Usually means: Harmful, damaging to health, poisonous.
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We found 50 dictionaries that define the word toxic:

General (24 matching dictionaries)
  1. toxic: Longman Dictionary of Contemporary English
  2. toxic, toxic-: Merriam-Webster
  3. toxic: Oxford Learner's Dictionaries
  4. toxic: American Heritage Dictionary of the English Language
  5. toxic, toxic-: Collins English Dictionary
  6. toxic: Vocabulary.com
  7. Toxic, toxic: Wordnik
  8. toxic: Cambridge Advanced Learner's Dictionary
  9. toxic: Wiktionary
  10. toxic: Webster's New World College Dictionary, 4th Ed.
  11. toxic: The Wordsmyth English Dictionary-Thesaurus
  12. toxic: Infoplease Dictionary
  13. toxic, toxic-: Dictionary.com
  14. toxic: Online Etymology Dictionary
  15. toxic: Cambridge Essential American English Dictionary
  16. Toxic (Britney Spears song), Toxic (Kehlani song), Toxic (album), Toxic (disambiguation), Toxic (film), Toxic (magazine), Toxic (single), Toxic (song), Toxic, Toxic: Wikipedia, the Free Encyclopedia
  17. Toxic: Online Plain Text English Dictionary
  18. toxic: Rhymezone
  19. toxic: AllWords.com Multi-Lingual Dictionary
  20. toxic: FreeDictionary.org
  21. toxic: Mnemonic Dictionary
  22. toxic, toxic-: TheFreeDictionary.com

Art (3 matching dictionaries)
  1. toxic: ArtLex Lexicon of Visual Art Terminology
  2. Toxic: Artist Search
  3. toxic-: A Cross Reference of Latin and Greek Elements

Business (4 matching dictionaries)
  1. toxic: Merriam-Webster Legal Dictionary
  2. Construction Term Glossary (No longer online)
  3. toxic: Legal dictionary
  4. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. toxic: Encyclopedia

Medicine (12 matching dictionaries)
  1. toxic: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Breast Cancer Talking Dictionary (No longer online)
  4. Toxic: Diabetes Dictionary
  5. online medical dictionary (No longer online)
  6. Health and Wellness Dictionary (No longer online)
  7. Probert Encyclopaedia of Medicine (No longer online)
  8. toxic: Prostate Cancer Interactive Glossary
  9. toxic: Dictionary of Cancer Terms
  10. -toxic, toxic, toxic(o)-: Medical dictionary
  11. Vitamin Glossary (No longer online)
  12. Hyperdictionary (No longer online)

Science (1 matching dictionary)
  1. Toxic: Material Safety Data Sheets HyperGlossary

Slang (1 matching dictionary)
  1. toxic: Urban Dictionary

Tech (4 matching dictionaries)
  1. toxic: NATURAL RESOURCES DEFENSE COUNCIL
  2. AUTOMOTIVE TERMS (No longer online)
  3. National Glass Association Glossary (No longer online)
  4. Lake and Water Word Glossary (No longer online)

(Note: See toxicity as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  (toxicology, pharmacology) Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities.
adjective:  (medicine) Appearing grossly unwell; characterised by serious, potentially life-threatening compromise in the respiratory, circulatory or other body systems.
adjective:  (figurative) Severely negative or harmful.
adjective:  (figurative, of a person) Hateful or strongly antipathetic.

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    neon green,     poison purple,     venomous violet, more...



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