Usually means: Device for hacking telephone systems.
Definitions Related words Mentions
We found 14 dictionaries that define the word blue box:

General (9 matching dictionaries)
  1. blue box: Merriam-Webster
  2. blue box: Oxford Learner's Dictionaries
  3. blue box: American Heritage Dictionary of the English Language
  4. blue box: Collins English Dictionary
  5. blue box: Wiktionary
  6. blue box: Infoplease Dictionary
  7. Blue Box, blue-box: Dictionary.com
  8. Blue Box (Kate Ceberano album), Blue Box (album), Blue Box (container), Blue Box (novel), Blue box (disambiguation), Blue box (phreaking), Blue box: Wikipedia, the Free Encyclopedia
  9. blue-box, blue box: TheFreeDictionary.com

Computing (2 matching dictionaries)
  1. Blue Box: Free On-line Dictionary of Computing
  2. Blue Box, Blue box (phreaking): Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. Agricultural Thesaurus and Glossary (No longer online)

Slang (1 matching dictionary)
  1. Blue Box: Urban Dictionary

Definitions from Wiktionary (blue box)

noun:  (chiefly British and Canada) A blue container used for the collection of household waste (such as tin cans and newspapers) for recycling by a municipal authority.
noun:  An electronic device used to bypass payment on a tone pulse telephone system.
noun:  (informal, US, meteorology) A "tornado watch" notification category.

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