magnesium
Cross references: 1. element mag.ne.sium \mag-'ne--ze--*m, -zh*m\ n [NL, fr. magnesia] : a silver-white light malleable ductile bivalent metallic element that oc curs abundantly in nature and is used in metallurgical and chemical processes, in photography, signaling, and pyrotechny because of the intense white light it produces on burning, and structurally esp. in the form of light alloys