How do you pronounce "radioactive"?

In American English: /ˌreɪdiːoʊˈæktɪv/ (rayd-ee-oh-AKT-iv). In British English: /ɹˌeɪdɪəʊˈæktɪv/ (r-ayd-i-OH-akt). In Canadian English: /ˌreɪdiːoʊˈæktɪv/ (rayd-ee-oh-AKT-iv). In Australian English: /ɹˌeɪdɪəʊˈaktɪv/ (r-ayd-i-OH).

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

Yes. In American English it's pronounced /ˌreɪdiːoʊˈæktɪv/ (rayd-ee-oh-AKT-iv), while in British English it's /ɹˌeɪdɪəʊˈæktɪv/ (r-ayd-i-OH-akt).

How to Pronounce "radioactive"

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radioactive

regional

/ˌreɪdiːoʊˈæktɪv/

rayd-ee-oh-AKT-iv

Syllable Breakdown

reɪdra·iːdi·oʊoac·æktti·ɪvve

Source

90%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14