Hadron definitions

hăd'rŏn'
Any of a class of subatomic particles that are composed of two or three quarks and participate in strong interactions. The class of hadrons is divided into the mesons and baryons.
noun
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Any of a class of subatomic particles, including the proton, neutron, meson, and hyperon, that consist of a combination of quarks and antiquarks.
noun
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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).
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(physics) A strongly interacting particle such as a proton. A particle which is affected by the strong nuclear force. A hadron is composed of quarks.
noun
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Origin of hadron

Greek hadros thick sā- in Indo-European roots –on