What does "infrared" mean?
The electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm.
Infrared
/ˌɪnfɹəˈɹed/ adj, noun
adj, noun ·Moderate ·College level
Meaning at a glance
- Primary sense: The electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm.
- Grammar: infrared is listed as adj, noun.
- Nearest alternatives: infrared radiation, cardinal, carmine, cerise.
- Useful contrasts: light, millimetre, ultraviolet.
- Usage evidence: People show up bright on an infrared camera because of their body heat.
How to use "infrared"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "infrared" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "infrared" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "infrared" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "infrared" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "infrared" is acting as adj, noun in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "infrared radiation" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "infrared", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 The electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm. uncountable
"Collisions of these 'transparent' molecules with the molecules that do have absorption bands in the infrared can have a considerable influence on the intensities of the observed absorption bands."
- 2 the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range wordnet
- 3 A specific wavelength in this range. countable
"Sonne has shown that by means of the luminous rays the temperature in the tissue may be raised to a higher degree than by the use of the infrareds."
- 4 electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves wordnet
- 5 A device that emits infrared radiation. countable
"In his room, he could install his infrareds without being discovered."
Adjective
- 1 Having a wavelength in the infrared spectrum. not-comparable
- 2 Relating to very low energies or very large distances or time spans. figuratively, not-comparable
"Unless otherwise stated, we will be working in Euclidean space compactified to a sphere in order to avoid infrared problems."
Adjective
- 1 having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end wordnet
Antonyms
Example
"People show up bright on an infrared camera because of their body heat."
Common questions
What is a synonym for "infrared"?
Common synonyms include: infrared radiation, cardinal, carmine, cerise, color, crimson.
How do you use "infrared" in a sentence?
People show up bright on an infrared camera because of their body heat.
How do you pronounce "infrared"?
Pronounced /ˌɪnfɹəˈɹed/.
Etymology
From infra- + red.