Etymology tree
Pre-Greekder.
Ancient Greek λέπω (lépō)
Proto-Indo-European *-tós
Proto-Hellenic *-tós
Ancient Greek -τός (-tós)
Ancient Greek λεπτόν (leptón)der.
English lepton
Derived from Ancient Greek λεπτόν (leptón, “small”).
From Ancient Greek λεπτόν (leptón), neuter form of λεπτός (leptós, “small”).
Meanings
A coin used since ancient times in Greece, serving in modern times as one hundredth of a phoenix, a drachma, and a euro (as the Greek form of the Eurocent).
A small, bronze Judean coin from the 1st century BCE, considered by some to be the widow's mite.
Etymology tree
Pre-Greekder.
Ancient Greek λέπω (lépō)
Proto-Indo-European *-tós
Proto-Hellenic *-tós
Ancient Greek -τός (-tós)
Ancient Greek λεπτόν (leptón)
Ancient Greek ἤλεκτρον (ḗlektron)bor.
Latin ēlectrum
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icus
New Latin ēlectricusbor.
English electric
Proto-Indo-European *h₁ey-
Proto-Indo-European *h₁éyti
Proto-Hellenic *éimi
Ancient Greek ἰόν (ión)der.
English ion
blend
English electronbf.
▲
Ancient Greek -ον (-on)influ.
English -on
English lepton
From Ancient Greek λεπτόν (leptón, “small”) + English -on.
From Ancient Greek λεπτός (leptós) + -on. Coined by Dutch-American physicist Abraham Pais in 1947.
Meanings
(particle) An elementary particle that has a spin of 1/2 (i.e., is a fermion) and does not interact via the strong nuclear force; examples include the electron, the muon, the neutrino and the tauon.
In the present paper we deal with the second order radiative correction to the beta disintegration of nucleon, assuming the Fermi's interaction between necleon and lepton fields, and show that there appears such an ultraviolet divergence as can not be removed by the procedure of renormalization of mass and coupling constant, so far as a single type of coupling is assumed for the decay Hamiltonian. 1950, Tadao Nakano, “Radiative Correction to Decay Processes”, in Progress of Theoretical Physics, volume 5, number 6: