- an aluminum coin of modern Greece until the euro was adopted, the 100th part of a drachma.
- a small copper or bronze coin of ancient Greece.
Origin of lepton1
1715–25; < Greek leptón (nómisma) a small (coin), noun use of neuter of leptós small; see lepto-
- any of a class of particles with spin of ½ that are not subject to the strong force and that are believed to be truly elementary and not composed of quarks or other subunits. The leptons known or believed to exist are the electron and electron-neutrino, the muon and mu-neutrino, and the tau lepton and tau-neutrino.
Compare conservation of lepton number.
Origin of lepton2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lepton
The smallest copper coin in use among the Jews, the lepton, called in Hebrew chalcous, "copper money."The Rand-McNally Bible Atlas
Jesse L. Hurlbut
Lepton, lep′ton, n. the smallest of modern Greek coins, 100 to the drachma.
The game was thus played in 1810, and is so still, both here and at Lepton.The Traditional Games of England, Scotland, and Ireland (Vol I of II)
Alice Bertha Gomme
A lepton is a very small brass Jewish coin worth half a Roman quadrans each, which is worth a quarter of the copper assarion.
- a former Greek monetary unit worth one hundredth of a drachma
- a small coin of ancient Greece
from Greek lepton (nomisma) small (coin)
- physics any of a group of elementary particles and their antiparticles, such as an electron, muon, or neutrino, that participate in electromagnetic and weak interactions and have a half-integral spin
C20: from lepto- + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for lepton
Online Etymology Dictionary, © 2010 Douglas Harper
- Any of a family of elementary particles that participate in the weak interaction, including the electron and its associated neutrino.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Any of a family of elementary particles that interact through the weak force and do not participate in the strong force. Leptons include electrons, muons, tau particles, and their respective neutrinos, the electron neutrino, the muon neutrino, and the tau neutrino. The antiparticles of these six particles are also leptons. Compare hadron. See Note at elementary particle. See Table at subatomic particle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.