(physics) A pictorial representation of the interactions of subatomic particles, showing their paths in space and time as lines, and their interactions as points where lines meet.

The state of being fey. / (Shetland, folklore, countable) A ghost resembling a living person, seeing which is an omen of that person's death.

plural of Feynman diagram

In a fey way.

The position (at the 762nd digit after the decimal point) in the decimal expansion of pi at which a sequence of six consecutive nines first appears, unexpectedly early in view of the expected and otherwise apparent randomness of said expansion.

superlative form of fey: most fey

The state of being fey or doomed.

Of or relating to Paul Feyerabend (1924–1994), Austrian-born philosopher of science.

Of or relating to Richard Feynman (1918–1988), American theoretical physicist known for his work in quantum mechanics, quantum electrodynamics, and particle physics.

Alternative spelling of feygele