How do you pronounce "radius"?

In American English: /ˈreɪdiːəs/ (RAYD-ee-uhs). In British English: /ɹˈeɪdɪəs/ (R-ayd-i). In Canadian English: /ˈreɪdiːəs/ (RAYD-ee-uhs). In Australian English: /ɹˈeɪdɪəs/ (R-ayd-i).

Is "radius" pronounced differently in American and British English?

Yes. In American English it's pronounced /ˈreɪdiːəs/ (RAYD-ee-uhs), while in British English it's /ɹˈeɪdɪəs/ (R-ayd-i).

How to Pronounce "radius"

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radius

regional

/ˈreɪdiːəs/

RAYD-ee-uhs

Syllable Breakdown

reɪdra·iːdi·əsus

Source

90%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14