Usually means: Light with short, high-energy wavelengths.
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We found 10 dictionaries that define the word blue light:

General (7 matching dictionaries)
  1. blue light: Merriam-Webster
  2. blue-light, blue light: Wordnik
  3. blue light: Wiktionary
  4. blue light: Dictionary.com
  5. Blue Light (TV series), Blue Light (counter-terrorist subunit), Blue Light (disambiguation), Blue Light (novel), Blue Light, Blue light (pyrotechnic signal), Blue light, The Blue Light (fairy tale): Wikipedia, the Free Encyclopedia
  6. blue light: FreeDictionary.org
  7. Blue light: TheFreeDictionary.com

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

Slang (2 matching dictionaries)
  1. blue light, blue light, blue light: Green’s Dictionary of Slang
  2. blue-light, blue light: Urban Dictionary

Definitions from Wiktionary (blue light)

noun:  (historical, chiefly nautical) A mixture of chemicals (including nitre, sulfur and antimony) used in the eighteenth and nineteenth centuries for night-time signaling and general illumination.
noun:  (US, colloquial, now historical) A New England federalist, who opposed the Anglo-American War of 1812; (loosely), a federalist.
noun:  (countable) A flashing light, usually fitted to an emergency vehicle.
noun:  Used other than figuratively or idiomatically: see blue, light.
verb:  (informal, intransitive) To travel quickly in a police or ambulance vehicle with the lightbar (and possibly the siren) activated.

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