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The Collaborative International Dictionary

hadron \hadron\ n. (Physics) any elementary particle that interacts strongly with other particles.

Douglas Harper's Etymology Dictionary

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.


n. (context particle English) A strongly interacting particle such as a proton. A particle which is affected by the strong nuclear force. A hadron is composed of quarks.


n. any elementary particle that interacts strongly with other particles


In particle physics, a hadron (, hadrós, "stout, thick") is a composite particle made of quarks held together by the strong force in a similar way as molecules are held together by the electromagnetic force.

Hadrons are categorized into two families: baryons, made of three quarks, and mesons, made of one quark and one antiquark. Protons and neutrons are examples of baryons; pions are an example of a meson. Hadrons containing more than three valence quarks ( exotic hadrons) have been discovered in recent years. A tetraquark state (an exotic meson), named the Z(4430), was discovered in 2007 by the Belle Collaboration and confirmed as a resonance in 2014 by the LHCb collaboration. Two pentaquark states ( exotic baryons), named and , were discovered in 2015 by the LHCb collaboration. There are several more exotic hadron candidates, and other colour-singlet quark combinations may also exist.

Of the hadrons, protons are stable, and neutrons bound within atomic nuclei are stable. Other hadrons are unstable under ordinary conditions; free neutrons decay with a half-life of about 611 seconds. Experimentally, hadron physics is studied by colliding protons or nuclei of heavy elements such as lead, and detecting the debris in the produced particle showers.

Usage examples of "hadron".

Physicists are now constructing a mammoth accelerator in Geneva, Switzerland, called the Large Hadron Collider.

Tortha Karf looked around apprehensively, as though estimating the damage an enraged Hadron Dalla could do to his office furnishings.

Akor-Neb Sector for over five centuries, he knew, but then, Hadron Dalla, Doctor of Psychic Science, and intertemporal trouble-carrier extraordinary, had only been on this sector for a little under a year.

Conversely, even if superpartner particles are not found by the Large Hadron Collider, this fact alone will not rule out string theory, since it might be that the superpartners are so heavy that they are beyond the reach of this machine as well.

In the foreground, wearing a tight skirt of deep blue and a short red jacket, was Hadron Dalla, just as she had looked in the solidographs taken in Dhergabar after her alteration by the First Level cosmeticians to conform to the appearance of the Malayoid Akor-Neb people.

Reality isn't composed of quarks, or bootstrapping hadrons, or subatomic exchange.

I've seen him only a time or two, but he had a foster brother who's with the auxiliaries who told me that Hadron is one of the Ravens and has been proscribed.

Tan Hadron of Hastor and I could give a good account of ourselves.

Physicists now speak of more than 200 kinds of hadrons, "elementary" heavy particles.

Put quarks together in their many attributes and you can account for (maybe) all those 200-odd hadrons (and have a system paralleling the leptons or light particles as a bonus).

Gell-Mann’s theory was that all hadrons were made up of still smaller, even more fundamental particles.

First came nuclear particles, hadrons and pious, electrons and protons, neutrons and quarks.

Tan Hadron turned to port so fast that the Dusar lay over on her side, and we on deck had to hang to anything we could get hold of to keep from going overboard.

He gazed at the tiny streak in the photograph and wondered what his buddies in the Harvard physics department would say when he told them he'd spent the weekend hanging out in a Large Hadron Collider admiring Z-particles.

She had to repress her startle reflex when she recognized Hadron Tharn.