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What does blue light mean?

Looking for the meaning or definition of the word blue light? Here's what it means.

Noun
  1. (historical, uncountable) A mixture of chemicals (including nitre, sulphur and antimony) used in eighteenth and nineteenth centuries for pyrotechnics, night-time signaling and general illumination.
  2. (countable) A flashing light, usually fitted to an emergency vehicle.
Verb
  1. (law enforcement) To travel quickly in a police vehicle with the lightbar (and possibly the siren) activated.
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