Webster's English Dictionary

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potassium

Cross references:
  1. element               
 
po.tas.si.um \p*-'tas-e--*m\ n [NL, fr. potassa potash, fr. E, potash] 
   often attrib  : a silver-white soft light low-melting univalent metallic 
   element of the  alkali metal group that occurs abundantly in nature esp. 
   combined in minerals