noun🔗Share光子The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson."Sunlight is made of tiny particles called photons. "太陽光は光子と呼ばれる小さな粒子でできています。physicsenergyastronomyelementphenomenaChat with AIVocabulary GamePractice Reading