1. (noun) an elementary particle that participates in weak interactions; has a baryon number of 0

• electron
• negatron
• mu-meson
• muon
• negative muon
• neutrino
• tau-minus particle
• tauon

1. (noun) 100 lepta equal 1 drachma in Greece

• greek monetary unit

2. (noun) an elementary particle that participates in weak interactions; has a baryon number of 0

• elementary particle
• fundamental particle
• fermion