How do you pronounce "nuclei"?

In American English: /ˈnuːkliːˌaɪ/ (NOOKL-ee-eye). In British English: /njˈuːklɪi/ (NY-ookl-i). In Canadian English: /ˈnuːkliːˌaɪ/ (NOOKL-ee-eye). In Australian English: /njˈuːklɪi/ (NY-ookl-i).

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

Yes. In American English it's pronounced /ˈnuːkliːˌaɪ/ (NOOKL-ee-eye), while in British English it's /njˈuːklɪi/ (NY-ookl-i).

How to Pronounce "nuclei"

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nuclei

regional

/ˈnuːkliːˌaɪ/

NOOKL-ee-eye

Syllable Breakdown

nuːklnu·iːcl·aɪei

Source

80%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14