invisible spectrum

American  

[in-viz-uh-buhl spek-truhm] / ɪnˈvɪz ə bəl ˈspɛk trəm /

noun

Physics.

1. the range of wavelengths of electromagnetic radiation that lie on either side of the visible spectrum and which consists of infrared and ultraviolet light.

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Etymology

Origin of invisible spectrum

First recorded in 1865–70

Example Sentences

HBO is tapping into the largely invisible spectrum of military trauma in a new documentary, “We Are Not Done Yet,” whose trailer premieres today.

From Salon

A big part of the government’s job in tech policy is regulating the invisible spectrum on which our wireless gadgets rely–cellphones, radios, broadcast television, Wi-Fi, Bluetooth, they all rely on spectrum to work.

From Time

These measurements show the colour of plants across both the visible and invisible spectrum.

From BBC

There are substances, however, on which the violet and ultra-violet waves exert a special decomposing power; and, by permitting the invisible spectrum to fall upon surfaces prepared with such substances, we reveal both the existence and the extent of the ultraviolet spectrum.

From Project Gutenberg

By special methods, not here detailed, we have at Alleghany compared the absorption, at various depths, of the sun's own atmosphere for each spectral ray, and are hence enabled to show, with approximate truth, I think for the first time, the original distribution of energy throughout the visible and invisible spectrum at the fount of that energy, in the sun itself.

From Project Gutenberg