Webster's English Dictionary

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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