blue light

[ bloo lahyt ]

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. 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.

Word History and Origins

Origin of blue light¹

First recorded in 1810–15

Example Sentences

Just then the father of the other family stepped closer to our car to wave goodbye, and in doing so he blocked the blue light.

From The Daily Beast

Through a front window I saw the blue light of the running projector, making silhouettes of the children.

From The Daily Beast

My gaze followed the blue light, watching it grow dimmer with distance.

From The Daily Beast

Generally speaking we want to expose ourselves to red light in the morning and night and blue light during the day.

From The Daily Beast

This wonderful—and free—app controls your screen and reduces blue light colors after the sun goes down.

From The Daily Beast

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.

From Project Gutenberg

Slowly this ray paled, and its golden radiance faded to a pale blue light.

From Project Gutenberg

A box near the coxswain a feet was opened, and a blue-light taken out.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg