異音
い
お
ん
Meanings
1
allophone
Linguistics term: a variant pronunciation of a phoneme that does not change meaning. Used in academic or technical contexts.
In Japanese, the moraic nasal ん has multiple allophones.
2
strange noise; unusual sound
General term for an odd, unfamiliar, or unexpected sound, often implying something is wrong or out of place.
I heard a strange noise from the engine, so I stopped the car immediately.