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blue light

(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.

ˈblu ˈlaɪtCurrent165 viewsLast reviewed Jun 29, 2026+ Add a definition
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3 definitions
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3 citations · last seen May 2026

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#1·Apr 27, 2026

(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.

Heard in the wild
  • “That’s the only blue light because even if they promise to, they can’t lower prices with a wand. They can undo the tariffs where they can but that’s all”

    — Bluesky· May 2026
  • “I'm giving away one of my YouTuber trade secrets here, which is that the blue light behind me in every video is just a cheap grow-light pointed at the blinds”

    — Bluesky· May 2026
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#2·Apr 27, 2026

(countable) A flashing light, usually fitted to an emergency vehicle.

Heard in the wild
  • “♡ ♡ get ready with bunny skincare but the music is both sides of my femininity i have a weird rash on the side of my chin so im trying to fix that rn with blue light >,<”

    — Bluesky· May 2026
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#3·Apr 27, 2026

(US, colloquial, now, historical) A New England federalist, who opposed the Anglo-American War of 1812; loosely, a federalist.

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