PHOTON


Meaning of PHOTON in English

pho ‧ ton /ˈfəʊtɒn $ ˈfoʊtɑːn/ BrE AmE noun [countable] technical

[ Date: 1900-2000 ; Origin: photo- + -on 'particle' (from ion ) ]

a unit of ↑ energy that carries light and has zero ↑ mass

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.