X(ks). X, the twenty-fourth letter of the English alphabet, has three sounds; a compound nonvocal sound (that of ks), as in wax; a compound vocal sound (that of gz), as in example; and, at the beginning of a word, a simple vocal sound (that of z), as in xanthic. See Guide to Pronunciation, 217, 270, 271.
The form and value of X are from the Latin X, which is from the Greek , which in some Greek alphabets had the value of ks, though in the one now in common use it represents an aspirated sound of k.
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Tue 18th December 2018