Webster's English Dictionary

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aluminum

Cross references:
  1. element               
 
alu.mi.num \*-'lu:-m*-n*m\ n [NL, fr. alumina] often attrib  : a bluish 
   silver-white malleable ductile light trivalent metallic element  with good 
   electrical and thermal conductivity, high reflectivity, and resistance to 
   oxidation that is the most abundant metal in the earth's crust occurring 
   always in combination