Sentence:  Manganism has been known about since the 19th century, when miners exposed to ores containing manganese, a silvery <WSD>metal</WSD>, began to totter, slur their speech and behave like someone inebriated. 
Meaning of the word marked with <WSD> tags:  Any of a number of chemical elements in the periodic table that form a metallic bond with other metal atoms; generally shiny, somewhat malleable and hard, often a conductor of heat and electricity.