Definitions
Elementary particle representing a quantum of light or electromagnetic radiation.
Word origin
From photo- + -on. Coined by American physicist Leonard Troland in 1916 as a unit of light hitting the retina, and later popularized in a more modern sense by Gilbert N. Lewis, with the term gaining acceptance in the physics community by the late 1920s.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Particle of light”6 letters
Not quite right?
"Search similar patterns."
P_____