noting or pertaining to the infrared or its component rays: infrared radiation.
- Compare ultraviolet.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use infrared in a sentence
Nor does the jet have the ability to capture high-definition video, utilize an infra-red pointer.
Equipped with both daylight and infra-red cameras, SGR-1 can identify targets at ranges of up to 2.5 miles.Smoke Rings, Mystery Backpacks and Gun-Toting Robots: The Weird Wartech of the Korean Conflict | Kyle Mizokami | April 3, 2014 | THE DAILY BEAST
The JAS 39E engine is from the U.S., the radar from Britain and the infra-red search and track system is from Italy.The Planet’s Best Stealth Fighter Isn’t Made in America | Bill Sweetman | March 24, 2014 | THE DAILY BEAST
These are pictures that officers took with infra-red cameras before moving in.Little Brother | Cory Doctorow
As it began to run a little hot the heat waves streamed out—visible to him as infra-red rays.The Velvet Glove | Harry Harrison
The bright feral light of the super-mongoose's eyes seemed to lance at Sowles, like an infra-red flash.Telempathy | Vance Simonds
Infra-red rays are not visible, and we will soon be out of sight of the reflectors.
In verification of this, I subjected the specimen to the action of infra-red radiation acting from all sides.Life Movements in Plants, Volume II, 1919 | Sir Jagadis Chunder Bose
British Dictionary definitions for infrared
the part of the electromagnetic spectrum with a longer wavelength than light but a shorter wavelength than radio waves; radiation with wavelength between 0.8 micrometres and 1 millimetre
of, relating to, using, or consisting of radiation lying within the infrared: infrared radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for infrared
Relating to the invisible part of the electromagnetic spectrum with wavelengths longer than those of visible red light but shorter than those of microwaves. See more at electromagnetic spectrum.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.