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Dictionary

  Definition of atomic number 21
  1. a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite
Similar Words: scandium, Sc

 

Substance Meronyms: thortveitite

 

 
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cabbage means any of various types of cabbage; any of various cultivars of the genus Brassica oleracea grown for their edible leaves or flowers; informal terms for money... more
 
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