lepton
A class of elementary particles in particle physics, such as electrons and neutrinos. Technical term.
The electron is a type of lepton.
General term for elementary particles, which includes leptons, quarks, and gauge bosons.
Compound of 軽 (light) and 粒子 (particle), a direct translation of the English term 'lepton' (from Greek leptos, meaning 'small' or 'thin').