Definition of hadron in English:



  • A subatomic particle of a type including the baryons and mesons that can take part in the strong interaction.

    • ‘Protons, neutrons, pions, and the elaborate array of other hadrons discovered in the last half-century are thought to be understood in terms of their constituent quarks and gluons.’
    • ‘For example, the earliest version of the theory could only accommodate bosons, whereas many hadrons - including the proton and neutron - are fermions.’
    • ‘The simplest hadrons are therefore mesons made from a quark and antiquark pair (where the difference is zero), and baryons made of three quarks (where the difference is three).’
    • ‘A proton, found in the nucleus of an atom, is composed of three quarks and is a hadron.’
    • ‘Beams of hadrons, such as protons, neutrons and ions, offer important advantages over X-ray radiotherapy.’


1960s: from Greek hadros bulky + -on.