infrared

adjective
in·​fra·​red | \ˌin-frə-ˈred, -(ˌ)frä-, -fə-\

Definition of infrared 

1 : situated outside the visible spectrum at its red end used of radiation having a wavelength between about 700 nanometers and 1 millimeter

2 : relating to, producing, or employing infrared radiation infrared therapy

3 : sensitive to infrared radiation infrared sensors that detect body heat

Keep scrolling for more

Other Words from infrared

infrared noun

Examples of infrared in a Sentence

Recent Examples on the Web

Using infrared cameras, an airplane survey of 8000 industry sites found that 4% had unusually high methane emissions, most tied to hatches and vents in natural gas storage tanks at extraction wells. Warren Cornwall, Science | AAAS, "Natural gas could warm the planet as much as coal in the short term," 21 June 2018 This nonablative device offers two settings that can be used together or separately: One remodels and stimulates collagen growth deep in the dermis, using infrared light and radio frequency (RF). Allure, "The Skin-Care Glossary: A Comprehensive Guide to Everything You Need to Know," 17 Aug. 2018 On the plus side, the mask’s ample wraparound design includes infrared lights meant to treat wrinkles, sensors to track your heart rate and movement, and embedded headphones that pipe in audio-meditation and sleepy soundscapes. Rebecca Dolan, WSJ, "Trouble Sleeping? High-Tech Masks Can Help," 25 July 2018 The study team also detected the unique infrared-light signatures of nanodiamonds — carbon crystals far smaller than a grain of sand — in these same three systems, and nowhere else. Mike Wall, Space.com, "Puzzling Cosmic Glow Is Caused by Diamond Dust Glamming Up Stars," 11 June 2018 Professor Mukherjee says that photons from high-energy sources tend to get absorbed by infrared background radiation. Eoin O'carroll, The Christian Science Monitor, "Neutrino demonstration heralds a new way of observing the cosmos," 12 July 2018 Designing something that can prevent this, and can thus carry camouflage into the infrared, has proved tricky. The Economist, "How to fool infrared vision gear into thinking you are not there," 5 July 2018 Could near-infrared light be used to excite, or trigger neurons? Rob Reid, Ars Technica, "Ars on your lunch break, week 3: Mary Lou Jepsen on AI and spooky brain scans," 29 June 2018 The new solar window technologies, however, absorb almost exclusively invisible ultraviolet (UV) or infrared light. Robert F. Service, Science | AAAS, "Skyscrapers could soon generate their own power, thanks to see-through solar cells," 28 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infrared.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of infrared

1881, in the meaning defined at sense 1

Keep scrolling for more

Learn More about infrared

Statistics for infrared

Last Updated

2 Dec 2018

Look-up Popularity

Time Traveler for infrared

The first known use of infrared was in 1881

See more words from the same year

Keep scrolling for more

More Definitions for infrared

infrared

adjective

English Language Learners Definition of infrared

: producing or using rays of light that cannot be seen and that are longer than rays that produce red light

infrared

adjective
in·​fra·​red | \ˌin-frə-ˈred \

Kids Definition of infrared

: being, relating to, or producing rays like light but lying outside the visible spectrum at its red end

infrared

adjective
in·​fra·​red | \ˌin-frə-ˈred \

Medical Definition of infrared 

(Entry 1 of 2)

1 : lying outside the visible spectrum at its red end used of radiation having a wavelength between about 700 nanometers and 1 millimeter

2 : relating to, producing, or employing infrared radiation infrared therapy

infrared

noun

Medical Definition of infrared (Entry 2 of 2)

: infrared radiation

Keep scrolling for more

More from Merriam-Webster on infrared

Rhyming Dictionary: Words that rhyme with infrared

Spanish Central: Translation of infrared

Nglish: Translation of infrared for Spanish Speakers

Comments on infrared

What made you want to look up infrared? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

amusing and light sparring with words

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!