radi-

ra·di-
UK/ˌɹeɪ̯.diː-/Canada, US/ˌɹeɪ̯.di-/Australia, New Zealand/ˌɹæɪ̯.diː-/Scotland/ˌɹe.di-/

A form of radio- — radiation, radioactive

OriginLatin radius, radiī →
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Meanings

radi-1

prefix
  1. alternativeAlternative form of radio-.

    radi- + opaque → radiopaque

radi-2

prefix
  1. alternativeAlternative form of radic-.

Origin

radi- · prefix

  1. Latinradius, radiī
  2. Englishradi-

Derived from Latin radius, radiī.

More words from Latin

Full word history & related roots →

radi- · prefix

  1. Latinrādīx, rādīcis
  2. Englishradi-

Derived from Latin rādīx, rādīcis.

More words from Latin

Full word history & related roots →
Cite this entry
APA

radi-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/radi-

MLA

“radi-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/radi-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “radi-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/radi-.

Source: radi- on Wiktionary, CC BY-SA 4.0.