infrared radiation

Cultural Dictionary
infrared radiation [(in-fruh-red)]

Invisible radiation in the part of the electromagnetic spectrum characterized by wavelengths just longer than those of ordinary visible red light and shorter than those of microwaves or radio waves. (Compare ultraviolet radiation.)

Note: The heat we feel from a glowing coal or an incandescent light bulb is from infrared rays.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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