English
diradiation
Diradiation comes from Latin dīradiō ‘to arrange in rays’, from radius ‘a spoke of a wheel’, and perhaps ultimately from Proto-Indo-European *neredʰ- ‘extend forth, rise, outward’.
- Proto-Indo-Europeanc. 4500–2500 BCE*neredʰ-1‘extend forth, rise, outward’uncertain
- Latinc. 75 BCE–200 CEradius2‘a spoke of a wheel’
- Latinc. 75 BCE–200 CEdīradiō2‘to arrange in rays’
- Englishearliest quotation 1725diradiation2
attested reconstructed ? uncertain or disputed deepest recorded ancestor
- 1 Wiktionary, Latin radius
- 2 Wiktionary, English diradiation
- Earliest quotation in Wiktionary’s entry: 1725, John Harris, Lexicon Technicum: Or: “ACTINOBOLISM, is the same with the Diffusion or Diradiation…”.
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*neredʰ-Wiktionary, Latin radius‘extend forth, rise, outward’uncertain
- Latinc. 75 BCE–200 CEradiusWiktionary, English diradiation‘a spoke of a wheel’
- Latinc. 75 BCE–200 CEdīradiōWiktionary, English diradiation‘to arrange in rays’
- Englishearliest quotation 1725diradiationWiktionary, English diradiation. Earliest quotation in Wiktionary’s entry: 1725, John Harris, Lexicon Technicum: Or: “ACTINOBOLISM, is the same with the Diffusion or Diradiation…”
Linked words
through Latin radius ‘a spoke of a wheel’
Today it means
noun The emission and diffusion of rays of light.
Sources
Sources: Wiktionary, “diradiation”; the older steps come from the Wiktionary entry for Latin radius. 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 *neredʰ- / diradiation