Usually means: Harmful when ingested, inhaled, contacted.
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We found 30 dictionaries that define the word poisonous:

General (24 matching dictionaries)
  1. poisonous: Merriam-Webster.com
  2. poisonous: Oxford Learner's Dictionaries
  3. poisonous: American Heritage Dictionary of the English Language
  4. poisonous: Collins English Dictionary
  5. poisonous: Vocabulary.com
  6. Poisonous, poisonous: Wordnik
  7. poisonous: Cambridge Advanced Learner's Dictionary
  8. poisonous: Wiktionary
  9. poisonous: Webster's New World College Dictionary, 4th Ed.
  10. poisonous: The Wordsmyth English Dictionary-Thesaurus
  11. poisonous: Infoplease Dictionary
  12. poisonous: Dictionary.com
  13. poisonous: Cambridge Essential American English Dictionary
  14. Poisonous: Wikipedia, the Free Encyclopedia
  15. Poisonous: Online Plain Text English Dictionary
  16. poisonous: Webster's Revised Unabridged, 1913 Edition
  17. poisonous: Rhymezone
  18. Poisonous: AllWords.com Multi-Lingual Dictionary
  19. poisonous: Webster's 1828 Dictionary
  20. poisonous: Free Dictionary
  21. poisonous: Mnemonic Dictionary
  22. poisonous: Dictionary/thesaurus

Business (1 matching dictionary)
  1. poisonous: Legal dictionary

Computing (1 matching dictionary)
  1. poisonous: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. poisonous: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. Encyclopedia of Graphic Symbols (No longer online)

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

(Note: See poisonously as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Containing sufficient poison to be dangerous to touch or ingest.
adjective:  Of an animal such as a snake or spider, or parts of its body: producing a toxin intended for defensive or offensive use which is usually injected into an enemy or prey by biting or stinging; hence, of a bite or sting: injecting poison.
adjective:  (figuratively) Negative, harmful.

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    neon green,     bright yellow,     toxic orange, more...



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