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...was telling her student to pronounce this word like колонель.
That's exactly how we were taught to pronounce "colonel" back in school: ~ "каланел".
It's wrong on both sides of the pond, isn't it?
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Originally Posted by
Rtyom 
We were taught to say 'kernal' and know that it's a British variant.
No-o-o. British vаriant is without "r" sound, something like "кён(э)л" (I'm judging by the British films
)
American variant seems to have a distinct "r", and sometimes sounds to me almost like "кёрэл".