FERMION

fermion

(noun) any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle

Source: WordNet® 3.1

Etymology

Noun

fermion (plural fermions)

(particle physics, Standard Model) Any elementary or composite particle that has half-integer spin and thus obeys Fermi–Dirac statistics and the Pauli exclusion principle (equivalently, a particle for which the wavefunction of any system of identical such particles changes sign whenever two are swapped); a baryon, a lepton or a quark;
(slightly more loosely) any such particle or any composite particle composed of fermions.