DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Sr
       n 1: a soft silver-white or yellowish metallic element of the
            alkali metal group; turns yellow in air; occurs in
            celestite and strontianite [syn: strontium, Sr, atomic
    number 38]
       2: the unit of solid angle adopted under the Systeme
          International d'Unites [syn: steradian, sr]