How many phonemes in the word onomatopoeia?

Let's break down the word "onomatopoeia" to count the phonemes:

* o - /oʊ/ (one phoneme)

* n - /n/ (one phoneme)

* o - /ɒ/ (one phoneme)

* m - /m/ (one phoneme)

* a - /ə/ (one phoneme)

* t - /t/ (one phoneme)

* o - /oʊ/ (one phoneme)

* p - /p/ (one phoneme)

* e - /iː/ (one phoneme)

* i - /aɪ/ (one phoneme - a diphthong)

* a - /ə/ (one phoneme)

Total: 12 phonemes