What is the meaning of x in X-ray?

Answer 1

XXX, XXXX, XXXXX

[fôreks′, fīveks′]

the designations for abnormal sex chromosome complements in the human female in which there are, respectively, three, four, or five instead of the normal two X chromosomes so that each somatic cell contains a total of 47, 48, or 49 chromosomes. Although there is no consistent phenotype associated with such aberrations, the risk of congenital anomalies and mental retardation in the affected individual increases significantly as the number of X chromosomes increases.

Ref. Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.

Answer 2

The answer is rather humorous actually. German physicist, Wilhelm Roentgen, discovered a new form of radiation in 1895. He called it X-radiation because he didn't know what it was. The name stuck and it's that type of radiation that is used to make x-ray exams today.

Answer 3

X does not mean anything much. It is a convenient designation for something that you can't identify...an unknown.

X-Rays in Urdu Na-maloum Shwaien

Answer 4

In medical terminology, x usually means "times" in a prescription.