赤外線

(1)a ray of infrared radiation; produces a thermal effect (as from an infrared lamp)

(2)赤外線放射線

(3)熱効果を作り出す（赤外線ランプように）

(4)electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves

(5)可視光線より長く、電波より短い波長の電磁放射