plural of x factor

(typography) The distance between the baseline and midline in a typeface, typically equal to the height of the lower-case letter x.

(astronomy) An alternate name for a transneptunian object.

Synonym of triple X syndrome

plural of X chromosome

Synonym of X-ray radiation

5-bromo-4-chloro-3-indolyl-β-D-galactopyranoside, used to detect β-galactosidase.

plural of x-height

(transitive) To cross out with a series of the letter X, or with scribbles or lines. / (computing) To close a window (typically by clicking a button marked with an X symbol).

(fandom slang) The fictional world, or universe, which serves as the setting for the Marvel Comics and film series featuring the characters, the X-Men.