The best way I would pronounce it in some cases would be "ks" but otherwise, like a "z" with the beginning of a word.
It depends. If the 'X' is at the beginning of a word, it makes the zzz sound (as in "xylophone") or a sound kind of like eggs (as in "Xavier"). However, if it is preceded by vowel, it makes the -cks sound. In "Xerox" it makes both the "z" and a "cks" sound.
A xylophone - they sound better when cold
The use of "an" before a word starting with the letter X is determined by the sound that follows it. If the word starts with a vowel sound, like in "an umbrella," "an" is used. So, it's based on pronunciation rather than just the letter itself.
In a dictionary, the pronunciation guide for the word "X-ray" is: eks ˌrā Notice what the first letter of the pronunciation is e, which is a vowel, thus a vowel sound is the first sound produced when anyone pronounces the word X-ray correctly. The letter x can begin with either a vowel sound or a consonant sound depending on the word. In certain words that begin with x, the initial sound of the x is actually a z sound: xylophone is: zīləˌfōn Therefore, a xylophone would be correct. Use the a if the x is pronounced as a consonant; use an if the x is pronounced as a vowel.
The pronunciation of words is determined by language rules and conventions. In English, the "x" in "xylophone" is not pronounced as a "ks" sound because it follows the rules of the letter combination "xy" which is typically pronounced as a "z" sound.
Xylophonic is a nice word. It describes a sound made by a xylophone.
Although xenon, xylophone begin with an "x", the sound is a "z". The word x-ray begins with an "x" sound.
Not in English, however, there are a few words in the Greek that begin with the letter "Xi". This makes the sound of an "x" but was not translated to English in such a way.
In that word, X has a Z sound.
a sound is sounded and a letter is written
a sound is sounded and a letter is written
The Greek letter 'ita" is written like this in Greek: H (which looks like an h in English)