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2 definitions found

From: WordNet (r) 2.0

 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, atomic
            number 38]
      2: the unit of solid angle adopted under the Systeme
         International d'Unites [syn: steradian]

From: WordNet (r) 2.0

 sr.
      adj : used of the older of two persons of the same name especially
            used to distinguish a father from his son; "Bill Adams,
            Sr." [syn: elder, older]