1. Is the twenty-fourth letter of the English alphabet. In the middle and at the end of words it has the sound of ks or qs. At the beginning of a word it has precisoly the sound of z. It is used as an initial only in a few words borrowed from the Greek. As a numeral, X stands for ten; when horizontal, for 1,000; a dash over it, for ten thousand. It is the symbol of the unknown quantity in algebra. As an abbreviation, X. stands for Christ, as in Xn., Christian.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• fx,
• hx,
• xr,
• xs,
• xyz,
• chx,
• bx,
• nx,
• px,
• dx,
• sx,
• wx,
• xo,
• xd,
• xp,
• zx,
• jx,
• yx,
• axc,
• ahx

• xe,
• XIE,
• xyy,
• xii,
• Xu,
• xy,
• xi.

The adverb form of the word "X" is "Xly" or "Xingly".

The adjective form of the word "X" is "X-like" or "Xian".