Etymologically
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radio

Etymology and origin of the Latin word radio

History Permalink
Confidence
Established
Formation
Derivation
First attested
Varro
Ultimate origin
Latin (radius)

Pronunciation

  • IPA (Classical): [ˈra.di.oː][1]
  • IPA (Ecclesiastical): [ˈraː.di.o][1]

Forms

radiō (present infinitive radiāre, perfect active radiāvī, supine radiātum); first conjugation[1]

Etymology

It is from radius “spoke of a wheel, ray” with the verb suffix -ō, and a deponent ⟨radior⟩ is also found.[2][1][3]

Earliest recorded meaning

Lewis and Short cite Varro's rota radiāta “a spoked wheel”, and the TLL notes that the participle is attested first.[4][3] Köbler dates Varro 116–27 BC.[5]

Semantic evolution

In the sense of radius “spoke” it meant to furnish with spokes, as Varro's spoked wheel.[4] Its main sense was to radiate light, beam, shine, and Ovid uses the deponent, and also radiārī gemmīs “to gleam with jewels”.[2][6]

In Ecclesiastical Latin it meant to radiate, emit rays.[7] English radiate came in the 1610s from its participle radiātus, and English radiation in the mid-15th century from radiātiō.[8] It survives in Italian raggiare and French rayer.[1]

Timeline

  • 116–27 BC – Varro has rota radiāta.[4][5]
  • 43 BC–18 AD – Ovid uses it of gleaming.[2][6][5]
  • 1610s – English radiate is recorded.[8]

Meanings

Verb

  1. To furnish with spokes.[4]
  2. To radiate, beam, shine.[2]

Word family

  • irradiō
  • obradiō
  • praeradiō
  • radiāns
  • radiātilis
  • radiātiō
  • radiātus
  • surradiō

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ a b c Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ a b Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
Cite this entry

“Radio.” Etymologically, 16 Oct. 2026, etymologically.com/la/radio. Accessed 16 Oct. 2026.

Last edited on . ·