English
hadron
Hadron comes from Ancient Greek ἁδρός ‘thick’, and perhaps goes back to Proto-Indo-European *seh₂- ‘to fill up, satiate, satisfy’.
- Proto-Indo-Europeanc. 4500–2500 BCE*seh₂-1‘to fill up, satiate, satisfy’uncertain
- Ancient Greekc. 800–300 BCEἁδρός2hadrós‘thick’
- Englishearliest quotation 1996hadron2
attested reconstructed ? uncertain or disputed deepest recorded ancestor
- 1 Wiktionary, Ancient Greek ἁδρός
- 2 Wiktionary, English hadron
- Earliest quotation in Wiktionary’s entry: 1996, J. R. Batley, Measurements of B Hadron Lifetimes at LEP: “The weak decays of b hadrons are dominated by…”.
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*seh₂-Wiktionary, Ancient Greek ἁδρός‘to fill up, satiate, satisfy’uncertain
- Ancient Greekc. 800–300 BCEἁδρόςWiktionary, English hadronhadrós‘thick’
- Englishearliest quotation 1996hadronWiktionary, English hadron. Earliest quotation in Wiktionary’s entry: 1996, J. R. Batley, Measurements of B Hadron Lifetimes at LEP: “The weak decays of b hadrons are dominated by…”
The story
Coined by Russian physicist Lev Okun in 1962 in a plenary talk at the International Conference on High Energy Physics.
Linked words
through Proto-Indo-European *seh₂- ‘to fill up, satiate, satisfy’
sad, insane, secular, sane, sanity, sanitary, saturation, insatiable, saturate, sade, satiety, satiate, 18 more
Today it means
noun A composite particle that comprises two or more quarks held together by the strong force and (consequently) can interact with other particles via said force; a meson or a baryon.
Sources
Sources: Wiktionary, “hadron”; the older steps come from the Wiktionary entry for Ancient Greek ἁδρός. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / Proto-Indo-European *seh₂- / hadron