infrared
UK: ˌɪnfrəˈred | US: ˌɪnfrəˈred
adj. relating to or denoting electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves.
n. infrared radiation or the infrared part of the spectrum.
infrared = infra<below> + red<red>
- infra (Latin origin): Means "below" or "beneath." In modern usage, it often refers to something that is lower in position or beyond a certain threshold (e.g., infrastructure, infrasonic).
- red (Old English "rēad"): Refers to the color red, the longest wavelength of visible light. Here, it symbolizes the edge of the visible spectrum.
Etymology Origin:
The term "infrared" was coined in the early 19th century by astronomer William Herschel, who discovered this type of radiation by measuring heat beyond the red end of the visible spectrum. The word combines "infra" (below) and "red" to signify "below red" in the electromagnetic spectrum—logically extending the color-based naming convention of visible light.
Snakes can detect infrared radiation to locate warm-blooded prey.
Infrared cameras are used in night vision technology.
The remote control emits an infrared signal to operate the TV.
Astronomers study infrared images to observe distant star-forming regions.
Infrared saunas are popular for their therapeutic heat benefits.