Infrared/ˌɪnfrəˈred/ Definition 1 of 2Pro Tip 1/3Technological Uses Used often to discuss technologies for heat sensing and night vision. Infrared cameras are essential for capturing wildlife at night. Pro Tip 2/3Feeling Heat Infrared is frequently associated with warmth; devices may emit infrared to produce heat. The room was equipped with an infrared heater. Pro Tip 3/3Scientific Context Often used in scientific and technical discussions about wavelengths and energy. This material has a high absorption rate in the infrared spectrum.