(informal) Short for fragile X syndrome.

plural of X chromosome

plural of x-height

(finance) Abbreviation of ex dividend.

Synonym of X-ray radiation

(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).

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

plural of x-ray

Abbreviation of moto-cross.

(informal, usually used attributively) cross-country / (informal) cross-country skiing