infrarednoun/ˌɪnfɹəˈɹɛd/

• 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.

  • 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

  A specific wavelength in this range.

  • 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.
• 3

  A device that emits infrared radiation.

  • In his room, he could install his infrareds without being discovered.
  • Beams are the active counterparts of passive infrareds (PIRs). Since these are active infrareds, they require two parts: a transmitter and a receiver.

infraredadj/ˌɪnfɹəˈɹɛd/

• 1

  Having a wavelength in the infrared spectrum.

• 2

  natural-sciencesphysical-sciencesphysicsRelating to very low energies or very large distances or time spans.

  • Unless otherwise stated, we will be working in Euclidean space compactified to a sphere in order to avoid infrared problems.
  • Secondly, as stated already by Osborne & Provenzale, pure k^(-α)-behaviour is impossible since there would have to be infinite power at zero frequency (this would correspond to an infrared catastrophe).