10. 
    positron
    positron, antielectron 1. An elementary particle having the same mass and magnitude of charge as an electron but exhibiting a positive charge; a positive electron. 2. A positively charged particle of the same mass and magnititude of charge as an electron; a positive electron.
    Found op http://www.wordinfo.info/words/index/info/view_unit/2190/3
    
    
11. 
    Positron
    The antiparticle of the electron. It has the same mass as the electron but opposite (positive) electrical charge.
    Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html
    
    
12. 
    Positron
    0.510998910(13) MeV/c2 | decay_time = | decay_particle = | electric_charge = +1 e The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1e, a spin of ½, and has the same mass as an electron. When a low-energy positro...
    Found op http://en.wikipedia.org/wiki/Positron
    
    
13. 
    Positron
    The antiparticle of the electron. It has the same mass as the electron but opposite (positive) electrical charge.
    Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
    
    
14. 
    positron
    elementary particle with one positive elementary electric charge and the same rest mass as the electron
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=111-14-12
    
    
15. 
    positron
    elementary particle with one positive electric charge of +e and the same rest mass as the electron
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-11-08
    
    
16. 
    positron
    an electron with positive charge
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-02-58
    
    
17. 
    positron
    Anderson's cloud chamber picture of cosmic radiation from 1932 showing for the first time the existence of the anti-electron that we now call the positron. In the picture a charged particle is seen entering from the bottom at high energy. It then looses some of the energy in passing through the 6 mm...
    Found op http://www.daviddarling.info/encyclopedia/P/positron.html
    
    
18. 
    positron
    positron: see antiparticle.
    Found op http://www.infoplease.com/ce6/sci/A0917692.html
    
    
19. 
    Positron
    A positron is a positively-charged particle of the same mass as the electron and with a charge equivalent but opposite in sign to that of the electron.
    Found op http://www.probertencyclopaedia.com/browse/GP.HTM
    
    
20. 
    positron
    (β+) Type: Term Pronunciation: poz′i-tron Definitions: 1. A subatomic particle of mass and charge equal to the electron but of opposite (positive) charge. Synonyms: positive electron
    Found op http://www.medilexicon.com/medicaldictionary.php?t=71371
    
    
21. 
    positron
    Antiparticle of the electron; an elementary particle having the same mass as an electron but exhibiting a positive charge. The positron was discovered in 1932 by US physicist Carl Anderson at the California Institute of Technology, USA, its existence having been predicted by the British physicist Pa...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0029010.html
    
    
22. 
    Positron
    Antiparticle of the electron.
    Found op http://www2.slac.stanford.edu/vvc/glossary.html
    
    

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