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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.

Etymology

Origin of invisible spectrum

First recorded in 1865–70

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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