I agree the original 'ksi' does not have a silent 'k', and doesn't when used in mathematics, but, when misused in 'english' words, with a leading 'x', the 'ks' comes out as a 'z'. Xenon is never Ksenon.
Xenon is pronounced as “zenon”?
Yep, the only option is short or long 'e'.
@Tijmen started
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I agree the original 'ksi' does not have a silent 'k',
and doesn't when used in mathematics,
but, when misused in 'english' words, with a leading 'x',
the 'ks' comes out as a 'z'.
Xenon is never Ksenon.