Zawiercie (zävyĕrˈchĕ) [key], city (1992 est. pop. 56,000), Śląskie prov., S Poland, on the Warta River. Its industries produce metals, glass, machinery, chemicals, and apparel. Lignite and iron ore are mined nearby. Zawiercie passed to Prussia in 1795, to Russia in 1815, and to Poland after World War I.