blue light

American  

[bloo lahyt] / ˈblu ˈlaɪt /

noun

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. American History, Usually Disparaging. Also Blue Light 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.

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Etymology

Origin of blue light

First recorded in 1810–15

Example Sentences

The researchers generated 19 new variants that showed greater sensitivity to light, reduced activity in darkness, or the ability to respond to green light rather than only blue light.

From Science Daily

Later, when the blue light is being run down Ilana’s body, her hospital gown is carefully place to avoid exposure.

From Los Angeles Times

The crescent moon shone overhead, and the blue light of the day made it seem as though nothing had changed.

From Literature

Most of these children were born during the pandemic and spent much of their infancy quarantined indoors, their earliest socialization filtered through the blue light of tablets and television, Aguet said.

From Los Angeles Times

The words pulse in blue light.

From Literature