blue light

[ bloo-lahyt ]

  1. a band of the visible light spectrum that has a shorter wavelength and produces higher energy than other colors of light: occurring in sunlight and emitted by electronic devices that use LED technology.

  2. Also Blue Light .American History, Usually Disparaging. a member of a faction of the American Federalist party considered disloyal for opposing the War of 1812: so called from the claim that they flashed blue light signals to alert the British to the presence of blockade runners.

Origin of blue light

First recorded in 1810–15

Words Nearby blue light Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use blue light in a sentence

  • On the dahabeeyah, which began to look as if it were a long way off and were receding from her, shone a red and a blue light.

    Bella Donna | Robert Hichens
  • Slowly this ray paled, and its golden radiance faded to a pale blue light.

    Honey-Bee | Anatole France
  • A box near the coxswain a feet was opened, and a blue-light taken out.

  • Here and there were those that entered a shaft of pale-blue light that somehow outshone the sun.

  • Pale Blue—light part of Starling's quill feather for wings, pale yellow silk for body, pale yellow dun hackle for legs and tail.

    The Teesdale Angler | R Lakeland