Abrasion

[Lat. abrado, I rub off.] In Numismatology, implies the waste of coin, or the lo by wear and tear in the pocket. This forms a considerable item in the expense of a metallic currency, and various means have been employed to le en it, - by alloying the coins `so as to render them harder; by raising the border, so as to le en the surface exposed to be rubbed, . (Med.) A superficial excoriation; an ulceration of the skin. Abras'ite. ( Min .) A mineral of the zeolite family, found on Vesuvius. It occurs, united with Phillipsite, in quadratic octahedrons, aggregated in ma es. Transparent, with grayish-white color. Called, also, gism ondine and zeagonite .