How do you pronounce "ionosphere"?

In American English: /ˌaɪˈɑːnɔsˌfiːr/ (eye-AHN-aws-feer). In British English: /ˈaɪənˌɒsfiə/ (EYE-uhn-osf-ee-uh). In Canadian English: /ˌaɪˈɑːnɔsˌfiːr/ (eye-AHN-aws-feer). In Australian English: /ˈaɪənˌɒsfiə/ (EYE-uhn-osf-ee-uh).

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

Yes. In American English it's pronounced /ˌaɪˈɑːnɔsˌfiːr/ (eye-AHN-aws-feer), while in British English it's /ˈaɪənˌɒsfiə/ (EYE-uhn-osf-ee-uh).

How to Pronounce "ionosphere"

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ionosphere

regional

/ˌaɪˈɑːnɔsˌfiːr/

eye-AHN-aws-feer

Syllable Breakdown

aɪio·ɑːnno·ɔssph·fiːrere

Source

80%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14