An Etymological Dictionary of Astronomy and Astrophysics

A schematic representation, in quantum electrodynamics and quantum chromodynamics,
of the way elementary particles like electrons and protons interact with each other by exchanging photons. Use of Feynman diagrams can greatly reduce the amount of computation involved in calculating a rate or cross section of a physical process.

See also: After the American physicist Richard P. Feynman (1918-1988), Nobel prize 1965; → diagram.