Noun
Pfaffian (plural Pfaffians)
(mathematics) The determinant of a skew-symmetric matrix, capable of being written as the square of a polynomial in the matrix entries.
Pfaffian (plural Pfaffians)
(historical) A member of a circle of artists that met at Pfaff's, a restaurant on Broadway.
pfaffian (plural pfaffians)
Alternative letter-case form of Pfaffian