(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).

(biochemistry) A glycoprotein that has a regulatory function in kidney development. / (genetics) The gene that codes for this protein.

simple past tense and past participle of concession

(mineralogy) An orthorhombic-pyramidal mineral containing calcium, carbon, hydrogen, oxygen, and uranium.