Standard Lemma guide

radio-

prefix · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • US: Recorded audio is listed in the source snapshot.
  • homophone: radio

1

prefix

Meaning 1

radiation, radioactive

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

Examples

  • e.g. radiotherapy, radioactinium, radiolucent

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

prefix

Meaning 2

radio (broadcasting)

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

Examples

  • e.g. radiotelemetry, radioacoustics, radiotelegraph

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

prefix

Meaning 3

radius (bone)

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

Topics: anatomy, medicine, sciences

Examples

  • e.g. radiobicipital

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

prefix

Meaning 4

radius

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

Topics: geometry, mathematics, sciences

Examples

  • e.g. radiosymmetrical

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Derived from Latin radius (“ray”). By surface analysis, clipping of radiation + -o-.

Across languages

Translations

22 source translations are retained for this English entry.

  • Catalan: radio- — radiation
  • Finnish: radio- — radiation
  • French: radio- — radiation
  • German: radio- — radiation
  • Greek: ραδιο- (radio-) — radiation
  • Latin: radio- — radiation
  • Polish: radio- — radiation
  • Portuguese: radio- — radiation
  • Romanian: radio- — radiation
  • Russian: радио- (radio-) — radiation
  • Spanish: radio- — radiation
  • Catalan: radio- — radio, broadcasting
  • Finnish: radio- — radio, broadcasting
  • French: radio- — radio, broadcasting
  • German: funk- — radio, broadcasting
  • German: radio- — radio, broadcasting
  • Greek: ραδιο- (radio-) — radio, broadcasting
  • Polish: radio- — radio, broadcasting
  • Portuguese: radio- — radio, broadcasting
  • Romanian: radio- — radio, broadcasting
  • Russian: радио- (radio-) — radio, broadcasting
  • Spanish: radio- — radio, broadcasting