Definitions
Light or radiation just beyond red in the spectrum.
Word origin
From infra- + red.
Used in a sentence
“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.”
“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.”
“Exposure of spectral pieces at centimeters, millimeters, and infrareds, which provide a top steadiness of the dependence "MCW radiation vs. parameter Δt" and its interannual (seasonal) dynamics.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“heat rays”8 letters
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