infrared

Invisible light with waves longer than red light, often used to detect heat or send signals.

• The camera detects infrared.
• Warm objects give off infrared even in total darkness.
• The sensor uses infrared to detect movement.

Similar words: infrared radiation

Common phrases: detect infrared, emit infrared, near infrared

One particular wavelength of invisible light beyond the red end of visible light.

• The instrument measured a specific infrared.
• The team selected an infrared for the laser.
• This infrared is absorbed strongly by the sample.

Similar words: infrared wavelength

Common phrases: selected infrared, specific infrared

A device that sends out invisible light beyond the red end of visible light.

• They installed an infrared above the door.
• The technician switched on the infrared to test its output.
• This infrared sends radiation toward the sensor.

Similar words: infrared emitter

Common phrases: install an infrared, switch on infrared

Describing invisible light with waves longer than red light.

• The device sends an infrared signal.
• Infrared light is invisible to our eyes.
• The camera records infrared radiation from warm objects.

Common phrases: infrared light, infrared radiation, infrared beam

Related to very low energies, very long distances, or very long periods of time in physics.

• The theory has an infrared limit.
• We studied infrared behavior at very low energies.
• The calculation contains an infrared divergence at large distances.

Common phrases: infrared limit, infrared divergence, infrared behavior