Lepton
A lepton is a type of subatomic particle, with neutrinos being a specific variety of leptons.

In 2366, Geordi La Forge's VISOR detected subatomic fluctuations, increasing gravitational fields and increased meson and lepton activity in the Barzan wormhole. This indicated that the wormhole was not as stable as initially assumed. La Forge subsequently informed the crew of a Ferengi shuttle about this and suggested to return to the Alpha Quadrant immediately, but was dismissed by Arridor. ()

See also
 Antilepton
 Lepton diffraction scan

External link 
 

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Particles