[had-ron] /ˈhæd rɒn/

noun, Physics.
any elementary particle that is subject to the strong interaction. Hadrons are subdivided into baryons and mesons.
any elementary particle capable of taking part in a strong nuclear interaction and therefore excluding leptons and photons

1962, from Greek hadros “thick, bulky,” the primary sense, also “strong, great; large, well-grown, ripe,” from PIE root *sa- “to satisfy” (see sad). With elementary particle suffix -on. Coined in Russian as adron.
Any of a class of subatomic particles composed of a combination of two or more quarks or antiquarks. Quarks (and antiquarks) of different colors are held together in hadrons by the strong nuclear force. Hadrons include both baryons (composed of three quarks or three antiquarks) and mesons (composed of a quark and an antiquark). The combination of quark colors in a hadron must be neutral, for example, red and antired (as in a pion) or red, blue, and green (as in a proton). Compare baryon, lepton.


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