From Longman Dictionary of Contemporary EnglishRelated topics: Physicselectrone‧lec‧tron /ɪˈlektrɒn $ -trɑːn/ noun [countable]HPa very small piece of matter with a negativeelectricalcharge that moves around the nucleus (=central part) of an atom → proton, neutronExamples from the Corpuselectron• Although small, these singlecrystals can be studied using an electronmicroscope.• The world it presents is populated by entities such as electrons and quarks.• Crystal cleanliness and crystallinity were checked by Augerelectron spectroscopy and lowenergy electron diffraction, respectively.• In electronsharing, a shared electron can not be considered to have been gained or lost.• The valency of an atom in a covalent molecule is the number of electrons shared by the atom in forming the bond.• Screen-printed silvermetalcontacts on the surface of the wafercollect the streams of electrons and produce an electriccurrent.• This leaves one electron on each carbon atom unaccounted for.• How neardepends on the electron energy.Originelectron(1800-1900)electro- + -on (as in ion)